{"gene":"CYFIP1","run_date":"2026-06-09T22:57:19","timeline":{"discoveries":[{"year":1998,"finding":"CYFIP1 (p140Sra-1/KIAA0068) was identified as a specific binding partner of GTP-bound Rac1 small GTPase but not GDP-Rac1, Cdc42, or RhoA. The N-terminal domain (amino acids 1-407) mediates Rac1 interaction. CYFIP1 also directly co-sediments with F-actin and co-localizes with dominant-active Rac1 and cortical actin at membrane ruffling areas.","method":"Affinity purification from bovine brain cytosol, GST-pulldown with GTPγS/GDP-loaded GTPases, co-sedimentation with F-actin, co-localization in KB cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution (pulldown, co-sedimentation) with domain mapping, replicated with recombinant protein and cell-based localization","pmids":["9417078"],"is_preprint":false},{"year":2008,"finding":"CYFIP1 directly binds the translation initiation factor eIF4E through a domain structurally related to 4E-BP translational inhibitors, thereby repressing translation initiation as part of the FMRP complex. BC1 RNA (another FMRP binding partner) increases the affinity of FMRP for the CYFIP1-eIF4E complex. BDNF or DHPG stimulation causes CYFIP1 to dissociate from eIF4E at synapses, triggering protein synthesis in an activity-dependent manner.","method":"Co-immunoprecipitation, in vitro binding assays, structural homology analysis, neuronal stimulation (BDNF/DHPG) with protein level measurements after CYFIP1 reduction by RNAi","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — direct binding assays, structural domain comparison, functional consequence of knockdown and stimulation, replicated with multiple approaches in same study","pmids":["18805096"],"is_preprint":false},{"year":2009,"finding":"CYFIP1, as a subunit of the WAVE complex regulating cytoskeletal dynamics, functions as an invasion suppressor in epithelial cancers. Silencing of CYFIP1 disturbs normal epithelial morphogenesis in vitro and cooperates with oncogenic Ras to produce invasive carcinomas in vivo by impairing WAVE-regulated actin dynamics and cell-cell adhesion and cell-ECM interactions.","method":"RNAi knockdown in epithelial cells, in vitro morphogenesis assays, in vivo xenograft cooperation with oncogenic Ras, genomic deletion analysis","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function with defined cellular phenotype (invasion), in vivo validation, mechanistic link to WAVE-regulated actin dynamics","pmids":["19524508"],"is_preprint":false},{"year":2013,"finding":"BDNF-driven synaptic signaling releases CYFIP1 from the translational inhibitory eIF4E complex, triggering mRNA translation, and simultaneously shifts CYFIP1 into the WAVE regulatory complex. Active Rac1 alters CYFIP1 conformation (demonstrated by intramolecular FRET), and is key in changing the equilibrium between the two complexes, coordinating protein translation and actin polymerization for correct dendritic spine morphology.","method":"Intramolecular FRET to detect conformational change, co-immunoprecipitation, CYFIP1 knockdown in neurons with spine morphology readout, BDNF stimulation assays, interactome mass spectrometry","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — FRET conformational measurement, reciprocal Co-IP, multiple orthogonal approaches, functional consequence in neurons","pmids":["24050404"],"is_preprint":false},{"year":2014,"finding":"CYFIP1 is highly enriched at synapses and regulates dendritic complexity, spine morphology, spine actin dynamics, and AMPA receptor lateral diffusion. Cyfip1 haploinsufficiency in mice leads to reduced dendritic complexity, increased mobile F-actin, enhanced GluA2-containing AMPA receptor mobility at synapses, and an altered immature-to-mature spine ratio in hippocampal CA1 neurons in vivo.","method":"In vitro neuronal overexpression and shRNA knockdown, live imaging (F-actin dynamics), single-particle tracking of AMPA receptors, in vivo analysis of Cyfip1 heterozygous mice (dendritic morphology, spine ratios)","journal":"Translational psychiatry","confidence":"High","confidence_rationale":"Tier 2 / Strong — bidirectional manipulation (KD and OE), in vitro and in vivo validation, multiple orthogonal readouts","pmids":["24667445"],"is_preprint":false},{"year":2014,"finding":"CYFIP1 overexpression activates mTOR signaling, as confirmed at the protein level in neuronal progenitors and in post-mortem brain from 15q11-13 duplication patients with ASD. mTOR inhibitor rapamycin rescues morphological abnormalities (cellular hypertrophy, dendritic spine changes) resulting from CYFIP1 overexpression.","method":"BAC transgenic mouse overexpressing Cyfip1, neuronal progenitor overexpression, gene expression profiling, western blot for mTOR pathway components, rapamycin rescue experiment","journal":"Molecular psychiatry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo and in vitro overexpression model with pharmacological rescue, single lab with multiple approaches","pmids":["25311365"],"is_preprint":false},{"year":2015,"finding":"MNK kinases (Mnk1/Mnk2) regulate the binding of eIF4E to CYFIP1; inhibition or genetic knockout of Mnks increases eIF4E-CYFIP1 binding, suggesting that MNK-dependent eIF4E phosphorylation promotes release of CYFIP1-mediated translational repression of FMRP-bound mRNAs.","method":"Co-immunoprecipitation of eIF4E-CYFIP1 in fibroblasts from Mnk1/2 knockout mice and with Mnk inhibitor Mnk-I1","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — reciprocal co-IP in genetic knockout and pharmacological inhibition, single lab, two complementary approaches","pmids":["25588502"],"is_preprint":false},{"year":2015,"finding":"CYFIP1 undergoes a butterfly-like conformational change (bringing N- and C-termini closer together) when released from WAVE regulatory complex partners, enabling interaction with eIF4E. The interaction of CYFIP1 with eIF4E and with the WRC are mutually exclusive, and Rac1-GTP directly promotes the switch from eIF4E-bound to WRC-bound CYFIP1 conformation.","method":"Molecular dynamics simulation on CYFIP1 extracted from known WRC crystal structure, supported by intramolecular FRET data and published structural/biochemical data showing mutual exclusivity","journal":"Journal of chemical theory and computation","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — MD simulation grounded in existing crystal structure and validated by FRET data from prior study; computational prediction plus experimental support from cited data","pmids":["26575774"],"is_preprint":false},{"year":2015,"finding":"Stapled peptides targeting the α-helical interface between WASF3 and CYFIP1 (WAHM peptides) destabilize the WASF3 complex, suppress RAC1 binding to the WASF3 complex, and inhibit cancer cell invasion. Genetic knockdown of CYFIP1 also destabilizes the WASF3 complex and suppresses invasion.","method":"Structure-based stapled peptide design, CYFIP1 RNAi knockdown, invasion assays, co-immunoprecipitation of RAC1 with WASF3 complex","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function and peptide-based disruption with defined invasion phenotype and RAC1 binding readout, single lab","pmids":["26676744"],"is_preprint":false},{"year":2016,"finding":"The WASF3-NCKAP1-CYFIP1 complex is required for breast cancer metastasis. NCKAP1 silencing destabilizes the WASF3 complex, preventing RAC1 association with the complex and suppressing invasion in vitro and spontaneous metastasis in vivo. Stapled peptides targeting the NCKAP1-CYFIP1 interface suppress RAC1 binding and invasion.","method":"siRNA knockdown of NCKAP1 in breast/prostate/colon cancer cells, in vivo metastasis model in immunocompromised mice, co-immunoprecipitation of RAC1 with WASF3 complex, stapled peptide treatment","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vitro and in vivo loss-of-function with defined metastasis phenotype, mechanistic dissection of RAC1-complex interaction, multiple cell lines","pmids":["27432794"],"is_preprint":false},{"year":2016,"finding":"Cyfip1 haploinsufficiency in juvenile mice increases presynaptic terminal size and enhances vesicle release probability, decreasing paired-pulse facilitation and increasing mEPSC frequency. These presynaptic alterations are caused by dysregulation of the WAVE regulatory complex downstream of Rac1, as shown by shRNA knockdown combined with expression of Cyfip1 mutants, and rescued by acute Rac1 inhibition.","method":"Cyfip1 heterozygous mice, shRNA knockdown with Cyfip1 mutant rescue constructs, electrophysiology (PPF, mEPSC), Rac1 inhibitor treatment in culture and hippocampal slices","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function with mutant rescue, pharmacological rescue (Rac1 inhibition), electrophysiology, multiple complementary approaches","pmids":["26843638"],"is_preprint":false},{"year":2017,"finding":"CYFIP1 and FMRP antagonize each other's function during neuromuscular junction growth in Drosophila and during new neuronal differentiation in adult mouse olfactory bulb. Mechanistically, FMRP and CYFIP1 modulate mTOR signaling in an antagonistic manner via independent pathways.","method":"Drosophila NMJ morphology analysis in cyfip/fmr1 mutants, adult mouse olfactory bulb neurogenesis assay, western blot for mTOR signaling components in double mutants","journal":"Disease models & mechanisms","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis in two model organisms, biochemical pathway analysis, single lab","pmids":["28183735"],"is_preprint":false},{"year":2017,"finding":"NOTCH1 directly controls CYFIP1 expression in keratinocytes. ChIP confirmed direct binding of NOTCH1 to the CYFIP1 promoter, and manipulation of the NOTCH1 pathway in keratinocytes altered CYFIP1 mRNA levels.","method":"Chromatin immunoprecipitation (ChIP) for NOTCH1 at CYFIP1 promoter, NOTCH1 overexpression and pathway manipulation in keratinocytes with RT-PCR/qPCR readout","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP directly confirms promoter binding, functional manipulation confirms transcriptional regulation, single lab","pmids":["28410392"],"is_preprint":false},{"year":2018,"finding":"GAS7b associates with CYFIP1 and WAVE2 complex to suppress breast cancer metastasis by blocking CYFIP1-Rac1 protein interaction, actin polymerization, and β1-integrin/FAK/Src signaling.","method":"Co-immunoprecipitation of GAS7-CYFIP1 complex, functional invasion/metastasis assays with GAS7 knockdown/overexpression, Rac1-CYFIP1 interaction assays, actin polymerization readouts","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with functional readout, mechanistic dissection of Rac1 binding, single lab","pmids":["29706651"],"is_preprint":false},{"year":2019,"finding":"Cyfip1 heterozygous mice have reduced functional connectivity, defects in white matter architecture, decreased myelination in callosal axons, and altered presynaptic function in callosal connections. Cyfip1 deficiency leads to impaired bilateral connectivity.","method":"Cyfip1 heterozygous mouse model, functional MRI connectivity, diffusion tensor imaging, electron microscopy of axon myelination, electrophysiology for presynaptic function","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (fMRI, DTI, EM, electrophysiology) in same genetic model, in vivo","pmids":["31371726"],"is_preprint":false},{"year":2019,"finding":"Cyfip1 haploinsufficiency in rats produces extensive white matter changes with myelin sheath thinning in the corpus callosum, independent of changes in axon number or diameter, associated with aberrant intracellular distribution of myelin basic protein in mature oligodendrocytes.","method":"Novel rat Cyfip1 heterozygous model, diffusion tensor imaging, transmission electron microscopy, immunohistochemistry for myelin basic protein in oligodendrocytes","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — DTI and TEM in novel rat model, orthogonal methods, replicated across species with [31371726]","pmids":["31371763"],"is_preprint":false},{"year":2019,"finding":"CYFIP1 and its paralog CYFIP2 are enriched at inhibitory postsynaptic sites. CYFIP1 upregulation increases excitatory synapse number/mEPSC frequency but decreases inhibitory synapse size and mIPSC amplitude. Conditional knockout of CYFIP1 in neocortical principal cells increases GABAA receptor β2/3-subunits and neuroligin 3 expression, enhancing synaptic inhibition.","method":"CYFIP1/2 overexpression in neurons (electrophysiology, immunostaining), conditional Cyfip1 knockout mice with immunoblot for GABAA subunits and neuroligin 3, mIPSC/mEPSC recordings","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — bidirectional manipulation (OE and cKO), electrophysiology and biochemistry, in vivo and in vitro","pmids":["30784587"],"is_preprint":false},{"year":2020,"finding":"CYFIP1 expression is preferentially localized to B1 neural stem cells (NSCs) in the adult mouse subventricular zone (SVZ). Acute deletion of Cyfip1 in adult NSCs causes rapid changes in adherens junction proteins and increased B1 cell proliferation and symmetric renewal at the ventricular surface, indicating CYFIP1 regulates NSC fate decisions.","method":"Immunofluorescence for CYFIP1 in adult SVZ, conditional Cyfip1 deletion in adult NSCs (Cre-lox), BrdU/EdU proliferation assays, immunostaining for adherens junction proteins","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with defined cellular phenotype and localization data, single lab","pmids":["31988061"],"is_preprint":false},{"year":2021,"finding":"Cyfip1 haploinsufficiency leads to increased numbers of adult-born hippocampal neurons due to reduced apoptosis (not altered proliferation), caused by a cell-autonomous failure of microglia to secrete appropriate pro-apoptotic factors. Additionally, adult-born neuron migration is abnormal due to altered Arp2/3-mediated actin dynamics.","method":"Cyfip1 heterozygous mice, BrdU/TUNEL assays for proliferation and apoptosis, microglia conditional experiments, pharmacological Arp2/3 inhibition, cell migration assays","journal":"Translational psychiatry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic loss-of-function with specific apoptosis vs proliferation dissection and Arp2/3 mechanism, single lab","pmids":["34031371"],"is_preprint":false},{"year":2021,"finding":"CYFIP1 regulates protein translation of NMDA receptor complex components at synapses. RNA immunoprecipitation sequencing (RIP-seq) identified NMDAR complex mRNAs as in vivo CYFIP1 targets. Loss- and gain-of-function mouse models show diametric changes in synaptic NMDAR levels due to dysregulated translation, resulting in bidirectional alteration of NMDAR-mediated signaling, rescuable by pharmacological normalization of NMDAR signaling.","method":"RIP-seq in mouse brain, electrophysiology for NMDAR-mediated signaling, western blot for synaptic NMDAR subunits in Cyfip1 LOF and GOF mice, pharmacological rescue","journal":"Biological psychiatry","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — RIP-seq identifies direct mRNA targets, bidirectional genetic models, biochemistry, electrophysiology, and pharmacological rescue","pmids":["34247782"],"is_preprint":false},{"year":2021,"finding":"Cyfip1 haploinsufficiency reduces synaptic (but not total) SynGAP1 levels during early postnatal development and in adults, associated with reduced Cdk5 levels and maintained CaMKII activation, increased Rac1 activity, elevated synaptic F-actin, and increased WAVE regulatory complex activity. Decreased synaptic SynGAP1 is associated with elevated synaptic GluA2, increased AMPA receptor-mediated responses, and increased synaptic mGluR1/5.","method":"Cyfip1 heterozygous mouse hippocampus, subcellular fractionation for synaptic vs total protein levels, kinase activity assays (Rac1 activity, CaMKII activation), F-actin sedimentation, electrophysiology","journal":"Frontiers in synaptic neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — subcellular fractionation, activity assays, electrophysiology, single lab with multiple approaches","pmids":["33613257"],"is_preprint":false},{"year":2022,"finding":"CYFIP1 (but not CYFIP2) associates with astrocytic focal adhesion proteins. Mass spectrometry-based interactome of CYFIP1 from knock-in mouse brains identified 131 CYFIP1-specific interactors with only 8 shared with CYFIP2 interactome. CYFIP1 was detected in both neurons and astrocytes by immunostaining and proximity ligation assay confirmed co-localization with focal adhesion proteins in astrocytes. CYFIP1 and CYFIP2 are not significantly co-immunoprecipitated with each other.","method":"Reciprocal co-IP from CYFIP1-2xMyc and CYFIP2-3xFlag knock-in mice, mass spectrometry interactome, size-exclusion chromatography, single-cell RNA-seq database analysis, immunocytochemistry, proximity ligation assay","journal":"Journal of neurochemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — knock-in mouse reciprocal co-IP with mass spectrometry interactome, multiple orthogonal methods including PLA, direct comparison with CYFIP2","pmids":["35567753"],"is_preprint":false},{"year":2023,"finding":"CYFIP1 loss-of-function in human microglia-like cells (derived from PBMCs and iPSCs) decreases synaptic vesicle phagocytosis (synaptic pruning), shifts microglial morphology toward a more ramified profile, and significantly reduces motility. CYFIP1-KO microglia retain the ability to differentiate but show functional deficits in synaptic engulfment.","method":"CRISPR knockout of CYFIP1 in patient-derived microglia-like cells and iPSC-derived microglia-like cells, synaptosome phagocytosis assay, morphological analysis, motility assay, multiple isogenic line pairs","journal":"Biological psychiatry","confidence":"High","confidence_rationale":"Tier 2 / Strong — orthogonal CRISPR constructs in multiple patient-derived cell lines with quantitative functional readouts, isogenic controls","pmids":["37573007"],"is_preprint":false},{"year":2023,"finding":"Two biallelic CYFIP1 missense variants in probands with intellectual disability and ASD are located in protein domains responsible for maintaining interactions within the WAVE regulatory complex, causing deficits in actin polymerization in patient skin fibroblasts and abnormal brain morphology and F-actin loss in Drosophila knockin mutants.","method":"Patient fibroblast actin polymerization assays, Drosophila knockin mutants for corresponding variants, brain morphology analysis in flies, behavioral assays","journal":"Biological psychiatry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — patient-derived cells with functional assay plus in vivo Drosophila knockin model, single lab","pmids":["37704042"],"is_preprint":false},{"year":2023,"finding":"CYFIP1 overexpression enhances localization of synaptic organizer neurexin 1 (NRXN1) at climbing fiber synaptic input sites on Purkinje cell primary dendrites and concomitantly enhances climbing fiber synaptic transmission (CF-EPSCs) in cerebellar Purkinje cells.","method":"CYFIP1 overexpressing mice, immunostaining for NRXN1 at climbing fiber synapses, whole-cell patch-clamp recordings of CF-EPSCs, two-photon GCaMP6f imaging of climbing fiber signals in vivo","journal":"Frontiers in cellular neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo imaging and electrophysiology in transgenic mice, single lab with two orthogonal approaches","pmids":["37545882"],"is_preprint":false},{"year":2024,"finding":"CYFIP1 (as part of the WAVE regulatory complex) is required for platelet lamellipodia formation. Platelet-specific Cyfip1 knockout mice fail to form lamellipodia on fibrinogen-coated surfaces and show enhanced spreading in structured micropatterns, demonstrating that CYFIP1-WRC-ARP2/3 axis controls platelet morphology. FAM49b (CYRI-B) negatively regulates WRC by competing for RAC1 binding, and its inhibitory effect requires functional CYFIP1-WRC.","method":"Platelet-specific Cyfip1-/-, Fam49b-/-, and double-knockout mice, platelet spreading assays on fibrinogen-coated surfaces and 2D micropatterns, morphology analysis","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-type specific KO with defined morphological phenotype in platelets, multiple genotypes tested, single lab","pmids":["38391912"],"is_preprint":false},{"year":2025,"finding":"CYFIP1 binds and stabilizes mRNAs of specific voltage-gated calcium channel subunits, explaining reduced intracellular calcium in Cyfip1-deficient cortical neurons and axons. Cyfip1 heterozygosity delays callosal axon growth and arborization in vivo, associated with impaired mitochondria morphology, activity, and motility. Elevating intracellular calcium rescues both delayed axonal growth and mitochondrial defects in Cyfip1-deficient neurons.","method":"Cyfip1 heterozygous mice (in vivo axon tracing), calcium imaging in neurons, mitochondrial morphology/motility imaging, RNA immunoprecipitation for voltage-gated calcium channel mRNAs, calcium elevation rescue experiments","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — RIP confirms direct mRNA binding, in vivo axon phenotype, calcium imaging, mitochondria assays, pharmacological rescue; multiple orthogonal methods","pmids":["41315480"],"is_preprint":false},{"year":2026,"finding":"Conditional deletion of Cyfip1 in mouse microglia reduces microglial morphological complexity and surveillance of the brain parenchyma (without affecting chemotaxis), increases CD68-positive lysosome volume, and enhances engulfment of presynapses, shifting microglia away from a homeostatic state.","method":"Conditional Cyfip1 knockout in microglia (Cre-lox), two-photon live imaging for microglial surveillance and chemotaxis, immunostaining for CD68 lysosomes, synapse engulfment assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with live imaging, multiple functional readouts (morphology, surveillance, chemotaxis, phagocytosis), in vivo","pmids":["41818151"],"is_preprint":false}],"current_model":"CYFIP1 is a dual-function scaffold protein that acts as a translational repressor by directly binding eIF4E (mimicking 4E-BP function) within an FMRP complex, and as an activator of actin polymerization as a core subunit of the WAVE regulatory complex (WRC); active Rac1-GTP drives a conformational switch in CYFIP1 that shifts it from the translational repressor complex to the WRC, coordinating activity-dependent mRNA translation and actin dynamics at synapses, while additionally stabilizing voltage-gated calcium channel mRNAs to control intracellular calcium and axon development, regulating NMDAR complex translation, controlling synaptic E/I balance, and governing microglial morphology, surveillance, and synaptic pruning through Arp2/3-dependent actin remodeling."},"narrative":{"mechanistic_narrative":"CYFIP1 is a dual-function scaffold protein that couples activity-dependent mRNA translation to actin cytoskeletal remodeling, integrating these outputs at synapses and other cellular interfaces through a single Rac1-gated conformational switch [PMID:9417078, PMID:24050404]. It directly binds the translation initiation factor eIF4E via a domain structurally related to 4E-BP inhibitors, repressing cap-dependent translation as part of an FMRP complex; BDNF or DHPG stimulation dissociates CYFIP1 from eIF4E to license local protein synthesis [PMID:18805096]. Independently, CYFIP1 is a core subunit of the WAVE regulatory complex (WRC) and binds GTP-loaded Rac1 through its N-terminal domain, co-sedimenting with F-actin to drive Arp2/3-dependent actin polymerization [PMID:9417078, PMID:26676744]. These two states are mutually exclusive: Rac1-GTP drives a butterfly-like conformational change that shifts CYFIP1 from the eIF4E-repressor complex into the WRC, thereby co-regulating translation and actin dynamics for proper dendritic spine morphology [PMID:24050404, PMID:26575774], with MNK-dependent eIF4E phosphorylation tuning the eIF4E–CYFIP1 interaction [PMID:25588502]. Through these activities CYFIP1 governs synaptic structure and function — controlling dendritic complexity, AMPA receptor mobility, presynaptic release, and excitatory/inhibitory balance [PMID:24667445, PMID:26843638, PMID:30784587] — and acts as an RNA-binding regulator that stabilizes voltage-gated calcium channel mRNAs to support axon growth and mitochondrial function [PMID:41315480] and controls translation of NMDA receptor complex mRNAs [PMID:34247782]. Beyond neurons, the CYFIP1-WRC-Arp2/3 axis shapes microglial morphology, surveillance, and synaptic pruning [PMID:37573007, PMID:41818151], regulates neural stem cell fate and white matter myelination [PMID:31988061, PMID:31371763], and as part of the WASF3/NCKAP1 complex suppresses cancer cell invasion and metastasis downstream of RAC1 [PMID:19524508, PMID:27432794]. Biallelic CYFIP1 missense variants disrupting WRC interactions cause intellectual disability and ASD with impaired actin polymerization [PMID:37704042].","teleology":[{"year":1998,"claim":"Established CYFIP1 as a Rac1 effector, defining its first molecular function by linking it specifically to active Rac1 signaling and the actin cytoskeleton.","evidence":"Affinity purification from brain cytosol, GST-pulldown with nucleotide-loaded GTPases, and F-actin co-sedimentation with domain mapping","pmids":["9417078"],"confidence":"High","gaps":["Did not identify CYFIP1 as a WRC subunit or define how Rac1 binding alters CYFIP1 activity","No translational function known at this stage"]},{"year":2008,"claim":"Revealed CYFIP1's second, unexpected function as a translational repressor that mimics 4E-BP, recasting it as a bifunctional protein bridging translation control and the FMRP pathway.","evidence":"Co-IP, in vitro binding, structural homology analysis, and BDNF/DHPG-stimulated protein synthesis after RNAi in neurons","pmids":["18805096"],"confidence":"High","gaps":["How translational repression is mechanistically reconciled with the actin/WRC role was not yet defined","Identity of repressed mRNA targets not established"]},{"year":2009,"claim":"Demonstrated that CYFIP1 acts as a WAVE-complex-dependent invasion suppressor, extending its actin-regulatory role into epithelial morphogenesis and tumorigenesis.","evidence":"RNAi knockdown with morphogenesis assays, in vivo Ras cooperation xenografts, and genomic deletion analysis","pmids":["19524508"],"confidence":"High","gaps":["Did not resolve the molecular interface between CYFIP1 and other WRC subunits","Relationship to translational function untested"]},{"year":2013,"claim":"Unified the two CYFIP1 functions into a single switch model, showing Rac1-driven conformational change toggles CYFIP1 between eIF4E-repressor and WRC states to co-coordinate translation and actin dynamics.","evidence":"Intramolecular FRET, reciprocal Co-IP, interactome mass spectrometry, and CYFIP1 knockdown with spine morphology readouts in neurons","pmids":["24050404"],"confidence":"High","gaps":["Structural basis of the conformational switch not directly resolved at atomic level","Kinetics of the switch in vivo unknown"]},{"year":2015,"claim":"Provided structural and regulatory detail for the switch — defining a butterfly-like conformational change, mutual exclusivity of eIF4E vs WRC binding, and MNK-dependent control of the eIF4E interaction.","evidence":"Molecular dynamics simulation grounded in the WRC crystal structure plus FRET data; reciprocal Co-IP in Mnk1/2 knockout and inhibitor-treated fibroblasts","pmids":["26575774","25588502"],"confidence":"Medium","gaps":["MD model and MNK regulation rest largely on a single lab each","Direct atomic structure of the eIF4E-bound CYFIP1 conformation not solved"]},{"year":2016,"claim":"Defined the WASF3-NCKAP1-CYFIP1 complex as a RAC1-dependent metastasis driver, and showed disrupting subunit interfaces suppresses invasion, validating the complex as a druggable unit.","evidence":"siRNA knockdown across cancer cell lines, in vivo metastasis models, RAC1-complex Co-IP, and stapled-peptide interface disruption","pmids":["27432794","26676744"],"confidence":"High","gaps":["Whether CYFIP1's translational function contributes to invasion not addressed","Specificity of peptide effects beyond the WASF3 complex not fully delimited"]},{"year":2016,"claim":"Established CYFIP1 dosage as a determinant of synaptic structure and function in vivo, linking haploinsufficiency to dendritic, spine, AMPA receptor, and presynaptic phenotypes via the WRC-Rac1 axis.","evidence":"Cyfip1 heterozygous mice, shRNA with mutant rescue, single-particle AMPA receptor tracking, electrophysiology, and Rac1 inhibitor rescue","pmids":["24667445","26843638"],"confidence":"High","gaps":["Relative contribution of translational vs actin functions to each phenotype not separated","Cell-type-specific origins of presynaptic effects partly unresolved"]},{"year":2017,"claim":"Showed CYFIP1 and FMRP antagonistically modulate mTOR signaling and that NOTCH1 transcriptionally controls CYFIP1, situating CYFIP1 within broader growth-signaling and gene-regulatory networks.","evidence":"Drosophila NMJ and mouse olfactory neurogenesis epistasis with mTOR immunoblotting; ChIP and pathway manipulation in keratinocytes","pmids":["28183735","28410392","25311365"],"confidence":"Medium","gaps":["Mechanism connecting CYFIP1 to mTOR is indirect and not biochemically resolved","NOTCH1 regulation shown in keratinocytes, not neurons"]},{"year":2019,"claim":"Expanded CYFIP1's role beyond synapses to circuit-level connectivity and white matter, showing haploinsufficiency disrupts myelination and bilateral connectivity across species.","evidence":"Cyfip1 heterozygous mice and rats with fMRI/DTI, electron microscopy, MBP immunohistochemistry, and electrophysiology","pmids":["31371726","31371763"],"confidence":"High","gaps":["Whether myelin defects are oligodendrocyte-autonomous vs axon-driven not fully resolved","Molecular mechanism linking CYFIP1 to MBP distribution unknown"]},{"year":2019,"claim":"Identified CYFIP1 as a regulator of synaptic excitatory/inhibitory balance enriched at inhibitory postsynaptic sites, distinguishing its role from paralog CYFIP2.","evidence":"Bidirectional manipulation (overexpression and conditional knockout) with electrophysiology and immunoblotting for GABAA subunits and neuroligin 3","pmids":["30784587"],"confidence":"High","gaps":["Molecular route by which CYFIP1 controls GABAA/neuroligin 3 levels not defined","Whether effect is translational or structural unresolved"]},{"year":2021,"claim":"Identified specific in vivo mRNA targets of CYFIP1 — NMDAR complex and SynGAP1-associated synaptic components — and microglial/Arp2/3-dependent control of adult neurogenesis, deepening the translational-regulator and actin roles.","evidence":"RIP-seq, bidirectional genetic models with electrophysiology and pharmacological rescue; subcellular fractionation and Rac1/CaMKII activity assays; BrdU/TUNEL with Arp2/3 inhibition","pmids":["34247782","33613257","34031371"],"confidence":"High","gaps":["How target-mRNA selectivity is achieved not defined","Some downstream signaling claims rest on single-lab correlative measurements"]},{"year":2022,"claim":"Defined a CYFIP1-specific interactome distinct from CYFIP2, including astrocytic focal adhesion proteins, establishing non-redundant and non-neuronal cellular contexts for CYFIP1.","evidence":"Reciprocal Co-IP from knock-in mice with mass spectrometry, size-exclusion chromatography, immunocytochemistry, and proximity ligation assay","pmids":["35567753"],"confidence":"High","gaps":["Functional consequences of focal-adhesion association not tested","Whether astrocytic CYFIP1 uses WRC or translational functions unknown"]},{"year":2023,"claim":"Linked CYFIP1 directly to disease and to microglial function, showing biallelic WRC-disrupting variants cause ID/ASD and that CYFIP1 loss impairs microglial synaptic pruning and motility.","evidence":"Patient fibroblast and Drosophila knockin actin assays; CRISPR knockout in patient- and iPSC-derived microglia-like cells with phagocytosis and motility readouts","pmids":["37704042","37573007","37545882"],"confidence":"Medium","gaps":["Causality of variants supported by model systems but limited human genetic replication","Microglial findings in vitro; in vivo confirmation pending"]},{"year":2025,"claim":"Established a new RNA-stabilization function — CYFIP1 binds and stabilizes voltage-gated calcium channel mRNAs to control intracellular calcium, axon growth, and mitochondrial health.","evidence":"RIP, calcium imaging, in vivo axon tracing, mitochondrial imaging, and calcium-elevation rescue in Cyfip1 heterozygous neurons","pmids":["41315480"],"confidence":"High","gaps":["Mechanism distinguishing mRNA stabilization from translational repression not resolved","Whether stabilization requires the WRC or eIF4E conformations unknown"]},{"year":2026,"claim":"Confirmed in vivo microglial roles, showing CYFIP1 maintains microglial surveillance, morphological complexity, and homeostatic state while restraining presynapse engulfment.","evidence":"Conditional microglial Cyfip1 knockout with two-photon live imaging, CD68 lysosome immunostaining, and synapse engulfment assays","pmids":["41818151"],"confidence":"High","gaps":["Whether engulfment phenotype is WRC/Arp2/3-mediated not directly demonstrated in this model","Circuit-level consequences of altered pruning not assessed"]},{"year":null,"claim":"It remains unresolved how CYFIP1 selects between its mutually exclusive translational-repressor, mRNA-stabilizing, and WRC actin-nucleating functions in a given cell type and whether a single molecular hierarchy governs all phenotypes.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying quantitative model partitioning translation vs actin functions across cell types","Atomic structure of the eIF4E-bound conformation unsolved","Mechanism of target-mRNA recognition undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0045182","term_label":"translation regulator activity","supporting_discovery_ids":[1,6,19]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[19,26]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[0,2]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,3]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[1,8]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[3,7]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,25]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[0,4]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[3,4,16,19]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[1,6,19]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,3,7]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[14,15,17,26]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[2,9,23]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[22,27]}],"complexes":["WAVE regulatory complex (WRC)","FMRP-eIF4E translational repressor complex","WASF3-NCKAP1-CYFIP1 complex"],"partners":["RAC1","EIF4E","FMR1","WASF3","NCKAP1","GAS7","FAM49B","NRXN1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q7L576","full_name":"Cytoplasmic FMR1-interacting protein 1","aliases":["Specifically Rac1-associated protein 1","Sra-1","p140sra-1"],"length_aa":1253,"mass_kda":145.2,"function":"Component of the CYFIP1-EIF4E-FMR1 complex which binds to the mRNA cap and mediates translational repression. 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May act as an invasion suppressor in cancers","subcellular_location":"Cytoplasm; Cytoplasm, perinuclear region; Cell projection, lamellipodium; Cell projection, ruffle; Synapse, synaptosome","url":"https://www.uniprot.org/uniprotkb/Q7L576/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CYFIP1","classification":"Not 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SYNDROME","url":"https://www.omim.org/entry/615656"},{"mim_id":"608147","title":"TUBULIN-GAMMA COMPLEX-ASSOCIATED PROTEIN 5; TUBGCP5","url":"https://www.omim.org/entry/608147"},{"mim_id":"608146","title":"NIPA MAGNESIUM TRANSPORTER 2; NIPA2","url":"https://www.omim.org/entry/608146"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in 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the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/41818151","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.11.14.688490","title":"Functional Genomic Profiling of Schizophrenia-Associated Genes Reveals Key Microglial Regulators","date":"2025-11-14","source":"bioRxiv","url":"https://doi.org/10.1101/2025.11.14.688490","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.10.23.683866","title":"CYFIP1 overexpression amplifies IL-6/STAT3 and IFN-gamma/STAT1 signaling: potential implications for neuroinflammation and autism spectrum disorder","date":"2025-10-24","source":"bioRxiv","url":"https://doi.org/10.1101/2025.10.23.683866","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.10.23.684145","title":"Sleeping ORANGE: A CRISPR-Transposase Hybrid Approach to Boost Endogenous Protein Tagging Efficiency","date":"2025-10-23","source":"bioRxiv","url":"https://doi.org/10.1101/2025.10.23.684145","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.07.05.663296","title":"Progressive Remodeling of Global Protein Interaction Networks in a Mouse Model of Tauopathy","date":"2025-07-06","source":"bioRxiv","url":"https://doi.org/10.1101/2025.07.05.663296","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.01.28.635349","title":"Differential endopeptidase requirements during adaptation to changing growth conditions in  <i>Vibrio cholerae</i>","date":"2025-01-28","source":"bioRxiv","url":"https://doi.org/10.1101/2025.01.28.635349","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.04.03.647056","title":"NHSL3 interacts with Ena/VASP proteins and the Scar/WAVE complex and promotes cell migration","date":"2025-04-04","source":"bioRxiv","url":"https://doi.org/10.1101/2025.04.03.647056","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":30774,"output_tokens":7523,"usd":0.102583,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":17020,"output_tokens":5566,"usd":0.112125,"stage2_stop_reason":"end_turn"},"total_usd":0.214708,"stage1_batch_id":"msgbatch_01ACAxJQabDsht39JXeWG22d","stage2_batch_id":"msgbatch_01QEU22A9U5sbPTgsMzTmvSf","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1998,\n      \"finding\": \"CYFIP1 (p140Sra-1/KIAA0068) was identified as a specific binding partner of GTP-bound Rac1 small GTPase but not GDP-Rac1, Cdc42, or RhoA. The N-terminal domain (amino acids 1-407) mediates Rac1 interaction. CYFIP1 also directly co-sediments with F-actin and co-localizes with dominant-active Rac1 and cortical actin at membrane ruffling areas.\",\n      \"method\": \"Affinity purification from bovine brain cytosol, GST-pulldown with GTPγS/GDP-loaded GTPases, co-sedimentation with F-actin, co-localization in KB cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution (pulldown, co-sedimentation) with domain mapping, replicated with recombinant protein and cell-based localization\",\n      \"pmids\": [\"9417078\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"CYFIP1 directly binds the translation initiation factor eIF4E through a domain structurally related to 4E-BP translational inhibitors, thereby repressing translation initiation as part of the FMRP complex. BC1 RNA (another FMRP binding partner) increases the affinity of FMRP for the CYFIP1-eIF4E complex. BDNF or DHPG stimulation causes CYFIP1 to dissociate from eIF4E at synapses, triggering protein synthesis in an activity-dependent manner.\",\n      \"method\": \"Co-immunoprecipitation, in vitro binding assays, structural homology analysis, neuronal stimulation (BDNF/DHPG) with protein level measurements after CYFIP1 reduction by RNAi\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — direct binding assays, structural domain comparison, functional consequence of knockdown and stimulation, replicated with multiple approaches in same study\",\n      \"pmids\": [\"18805096\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CYFIP1, as a subunit of the WAVE complex regulating cytoskeletal dynamics, functions as an invasion suppressor in epithelial cancers. Silencing of CYFIP1 disturbs normal epithelial morphogenesis in vitro and cooperates with oncogenic Ras to produce invasive carcinomas in vivo by impairing WAVE-regulated actin dynamics and cell-cell adhesion and cell-ECM interactions.\",\n      \"method\": \"RNAi knockdown in epithelial cells, in vitro morphogenesis assays, in vivo xenograft cooperation with oncogenic Ras, genomic deletion analysis\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function with defined cellular phenotype (invasion), in vivo validation, mechanistic link to WAVE-regulated actin dynamics\",\n      \"pmids\": [\"19524508\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"BDNF-driven synaptic signaling releases CYFIP1 from the translational inhibitory eIF4E complex, triggering mRNA translation, and simultaneously shifts CYFIP1 into the WAVE regulatory complex. Active Rac1 alters CYFIP1 conformation (demonstrated by intramolecular FRET), and is key in changing the equilibrium between the two complexes, coordinating protein translation and actin polymerization for correct dendritic spine morphology.\",\n      \"method\": \"Intramolecular FRET to detect conformational change, co-immunoprecipitation, CYFIP1 knockdown in neurons with spine morphology readout, BDNF stimulation assays, interactome mass spectrometry\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — FRET conformational measurement, reciprocal Co-IP, multiple orthogonal approaches, functional consequence in neurons\",\n      \"pmids\": [\"24050404\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CYFIP1 is highly enriched at synapses and regulates dendritic complexity, spine morphology, spine actin dynamics, and AMPA receptor lateral diffusion. Cyfip1 haploinsufficiency in mice leads to reduced dendritic complexity, increased mobile F-actin, enhanced GluA2-containing AMPA receptor mobility at synapses, and an altered immature-to-mature spine ratio in hippocampal CA1 neurons in vivo.\",\n      \"method\": \"In vitro neuronal overexpression and shRNA knockdown, live imaging (F-actin dynamics), single-particle tracking of AMPA receptors, in vivo analysis of Cyfip1 heterozygous mice (dendritic morphology, spine ratios)\",\n      \"journal\": \"Translational psychiatry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — bidirectional manipulation (KD and OE), in vitro and in vivo validation, multiple orthogonal readouts\",\n      \"pmids\": [\"24667445\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CYFIP1 overexpression activates mTOR signaling, as confirmed at the protein level in neuronal progenitors and in post-mortem brain from 15q11-13 duplication patients with ASD. mTOR inhibitor rapamycin rescues morphological abnormalities (cellular hypertrophy, dendritic spine changes) resulting from CYFIP1 overexpression.\",\n      \"method\": \"BAC transgenic mouse overexpressing Cyfip1, neuronal progenitor overexpression, gene expression profiling, western blot for mTOR pathway components, rapamycin rescue experiment\",\n      \"journal\": \"Molecular psychiatry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo and in vitro overexpression model with pharmacological rescue, single lab with multiple approaches\",\n      \"pmids\": [\"25311365\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MNK kinases (Mnk1/Mnk2) regulate the binding of eIF4E to CYFIP1; inhibition or genetic knockout of Mnks increases eIF4E-CYFIP1 binding, suggesting that MNK-dependent eIF4E phosphorylation promotes release of CYFIP1-mediated translational repression of FMRP-bound mRNAs.\",\n      \"method\": \"Co-immunoprecipitation of eIF4E-CYFIP1 in fibroblasts from Mnk1/2 knockout mice and with Mnk inhibitor Mnk-I1\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — reciprocal co-IP in genetic knockout and pharmacological inhibition, single lab, two complementary approaches\",\n      \"pmids\": [\"25588502\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CYFIP1 undergoes a butterfly-like conformational change (bringing N- and C-termini closer together) when released from WAVE regulatory complex partners, enabling interaction with eIF4E. The interaction of CYFIP1 with eIF4E and with the WRC are mutually exclusive, and Rac1-GTP directly promotes the switch from eIF4E-bound to WRC-bound CYFIP1 conformation.\",\n      \"method\": \"Molecular dynamics simulation on CYFIP1 extracted from known WRC crystal structure, supported by intramolecular FRET data and published structural/biochemical data showing mutual exclusivity\",\n      \"journal\": \"Journal of chemical theory and computation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — MD simulation grounded in existing crystal structure and validated by FRET data from prior study; computational prediction plus experimental support from cited data\",\n      \"pmids\": [\"26575774\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Stapled peptides targeting the α-helical interface between WASF3 and CYFIP1 (WAHM peptides) destabilize the WASF3 complex, suppress RAC1 binding to the WASF3 complex, and inhibit cancer cell invasion. Genetic knockdown of CYFIP1 also destabilizes the WASF3 complex and suppresses invasion.\",\n      \"method\": \"Structure-based stapled peptide design, CYFIP1 RNAi knockdown, invasion assays, co-immunoprecipitation of RAC1 with WASF3 complex\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function and peptide-based disruption with defined invasion phenotype and RAC1 binding readout, single lab\",\n      \"pmids\": [\"26676744\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The WASF3-NCKAP1-CYFIP1 complex is required for breast cancer metastasis. NCKAP1 silencing destabilizes the WASF3 complex, preventing RAC1 association with the complex and suppressing invasion in vitro and spontaneous metastasis in vivo. Stapled peptides targeting the NCKAP1-CYFIP1 interface suppress RAC1 binding and invasion.\",\n      \"method\": \"siRNA knockdown of NCKAP1 in breast/prostate/colon cancer cells, in vivo metastasis model in immunocompromised mice, co-immunoprecipitation of RAC1 with WASF3 complex, stapled peptide treatment\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vitro and in vivo loss-of-function with defined metastasis phenotype, mechanistic dissection of RAC1-complex interaction, multiple cell lines\",\n      \"pmids\": [\"27432794\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Cyfip1 haploinsufficiency in juvenile mice increases presynaptic terminal size and enhances vesicle release probability, decreasing paired-pulse facilitation and increasing mEPSC frequency. These presynaptic alterations are caused by dysregulation of the WAVE regulatory complex downstream of Rac1, as shown by shRNA knockdown combined with expression of Cyfip1 mutants, and rescued by acute Rac1 inhibition.\",\n      \"method\": \"Cyfip1 heterozygous mice, shRNA knockdown with Cyfip1 mutant rescue constructs, electrophysiology (PPF, mEPSC), Rac1 inhibitor treatment in culture and hippocampal slices\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function with mutant rescue, pharmacological rescue (Rac1 inhibition), electrophysiology, multiple complementary approaches\",\n      \"pmids\": [\"26843638\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CYFIP1 and FMRP antagonize each other's function during neuromuscular junction growth in Drosophila and during new neuronal differentiation in adult mouse olfactory bulb. Mechanistically, FMRP and CYFIP1 modulate mTOR signaling in an antagonistic manner via independent pathways.\",\n      \"method\": \"Drosophila NMJ morphology analysis in cyfip/fmr1 mutants, adult mouse olfactory bulb neurogenesis assay, western blot for mTOR signaling components in double mutants\",\n      \"journal\": \"Disease models & mechanisms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis in two model organisms, biochemical pathway analysis, single lab\",\n      \"pmids\": [\"28183735\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NOTCH1 directly controls CYFIP1 expression in keratinocytes. ChIP confirmed direct binding of NOTCH1 to the CYFIP1 promoter, and manipulation of the NOTCH1 pathway in keratinocytes altered CYFIP1 mRNA levels.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP) for NOTCH1 at CYFIP1 promoter, NOTCH1 overexpression and pathway manipulation in keratinocytes with RT-PCR/qPCR readout\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP directly confirms promoter binding, functional manipulation confirms transcriptional regulation, single lab\",\n      \"pmids\": [\"28410392\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"GAS7b associates with CYFIP1 and WAVE2 complex to suppress breast cancer metastasis by blocking CYFIP1-Rac1 protein interaction, actin polymerization, and β1-integrin/FAK/Src signaling.\",\n      \"method\": \"Co-immunoprecipitation of GAS7-CYFIP1 complex, functional invasion/metastasis assays with GAS7 knockdown/overexpression, Rac1-CYFIP1 interaction assays, actin polymerization readouts\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with functional readout, mechanistic dissection of Rac1 binding, single lab\",\n      \"pmids\": [\"29706651\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Cyfip1 heterozygous mice have reduced functional connectivity, defects in white matter architecture, decreased myelination in callosal axons, and altered presynaptic function in callosal connections. Cyfip1 deficiency leads to impaired bilateral connectivity.\",\n      \"method\": \"Cyfip1 heterozygous mouse model, functional MRI connectivity, diffusion tensor imaging, electron microscopy of axon myelination, electrophysiology for presynaptic function\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (fMRI, DTI, EM, electrophysiology) in same genetic model, in vivo\",\n      \"pmids\": [\"31371726\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Cyfip1 haploinsufficiency in rats produces extensive white matter changes with myelin sheath thinning in the corpus callosum, independent of changes in axon number or diameter, associated with aberrant intracellular distribution of myelin basic protein in mature oligodendrocytes.\",\n      \"method\": \"Novel rat Cyfip1 heterozygous model, diffusion tensor imaging, transmission electron microscopy, immunohistochemistry for myelin basic protein in oligodendrocytes\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — DTI and TEM in novel rat model, orthogonal methods, replicated across species with [31371726]\",\n      \"pmids\": [\"31371763\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CYFIP1 and its paralog CYFIP2 are enriched at inhibitory postsynaptic sites. CYFIP1 upregulation increases excitatory synapse number/mEPSC frequency but decreases inhibitory synapse size and mIPSC amplitude. Conditional knockout of CYFIP1 in neocortical principal cells increases GABAA receptor β2/3-subunits and neuroligin 3 expression, enhancing synaptic inhibition.\",\n      \"method\": \"CYFIP1/2 overexpression in neurons (electrophysiology, immunostaining), conditional Cyfip1 knockout mice with immunoblot for GABAA subunits and neuroligin 3, mIPSC/mEPSC recordings\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — bidirectional manipulation (OE and cKO), electrophysiology and biochemistry, in vivo and in vitro\",\n      \"pmids\": [\"30784587\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CYFIP1 expression is preferentially localized to B1 neural stem cells (NSCs) in the adult mouse subventricular zone (SVZ). Acute deletion of Cyfip1 in adult NSCs causes rapid changes in adherens junction proteins and increased B1 cell proliferation and symmetric renewal at the ventricular surface, indicating CYFIP1 regulates NSC fate decisions.\",\n      \"method\": \"Immunofluorescence for CYFIP1 in adult SVZ, conditional Cyfip1 deletion in adult NSCs (Cre-lox), BrdU/EdU proliferation assays, immunostaining for adherens junction proteins\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with defined cellular phenotype and localization data, single lab\",\n      \"pmids\": [\"31988061\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Cyfip1 haploinsufficiency leads to increased numbers of adult-born hippocampal neurons due to reduced apoptosis (not altered proliferation), caused by a cell-autonomous failure of microglia to secrete appropriate pro-apoptotic factors. Additionally, adult-born neuron migration is abnormal due to altered Arp2/3-mediated actin dynamics.\",\n      \"method\": \"Cyfip1 heterozygous mice, BrdU/TUNEL assays for proliferation and apoptosis, microglia conditional experiments, pharmacological Arp2/3 inhibition, cell migration assays\",\n      \"journal\": \"Translational psychiatry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic loss-of-function with specific apoptosis vs proliferation dissection and Arp2/3 mechanism, single lab\",\n      \"pmids\": [\"34031371\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CYFIP1 regulates protein translation of NMDA receptor complex components at synapses. RNA immunoprecipitation sequencing (RIP-seq) identified NMDAR complex mRNAs as in vivo CYFIP1 targets. Loss- and gain-of-function mouse models show diametric changes in synaptic NMDAR levels due to dysregulated translation, resulting in bidirectional alteration of NMDAR-mediated signaling, rescuable by pharmacological normalization of NMDAR signaling.\",\n      \"method\": \"RIP-seq in mouse brain, electrophysiology for NMDAR-mediated signaling, western blot for synaptic NMDAR subunits in Cyfip1 LOF and GOF mice, pharmacological rescue\",\n      \"journal\": \"Biological psychiatry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — RIP-seq identifies direct mRNA targets, bidirectional genetic models, biochemistry, electrophysiology, and pharmacological rescue\",\n      \"pmids\": [\"34247782\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Cyfip1 haploinsufficiency reduces synaptic (but not total) SynGAP1 levels during early postnatal development and in adults, associated with reduced Cdk5 levels and maintained CaMKII activation, increased Rac1 activity, elevated synaptic F-actin, and increased WAVE regulatory complex activity. Decreased synaptic SynGAP1 is associated with elevated synaptic GluA2, increased AMPA receptor-mediated responses, and increased synaptic mGluR1/5.\",\n      \"method\": \"Cyfip1 heterozygous mouse hippocampus, subcellular fractionation for synaptic vs total protein levels, kinase activity assays (Rac1 activity, CaMKII activation), F-actin sedimentation, electrophysiology\",\n      \"journal\": \"Frontiers in synaptic neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — subcellular fractionation, activity assays, electrophysiology, single lab with multiple approaches\",\n      \"pmids\": [\"33613257\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CYFIP1 (but not CYFIP2) associates with astrocytic focal adhesion proteins. Mass spectrometry-based interactome of CYFIP1 from knock-in mouse brains identified 131 CYFIP1-specific interactors with only 8 shared with CYFIP2 interactome. CYFIP1 was detected in both neurons and astrocytes by immunostaining and proximity ligation assay confirmed co-localization with focal adhesion proteins in astrocytes. CYFIP1 and CYFIP2 are not significantly co-immunoprecipitated with each other.\",\n      \"method\": \"Reciprocal co-IP from CYFIP1-2xMyc and CYFIP2-3xFlag knock-in mice, mass spectrometry interactome, size-exclusion chromatography, single-cell RNA-seq database analysis, immunocytochemistry, proximity ligation assay\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knock-in mouse reciprocal co-IP with mass spectrometry interactome, multiple orthogonal methods including PLA, direct comparison with CYFIP2\",\n      \"pmids\": [\"35567753\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CYFIP1 loss-of-function in human microglia-like cells (derived from PBMCs and iPSCs) decreases synaptic vesicle phagocytosis (synaptic pruning), shifts microglial morphology toward a more ramified profile, and significantly reduces motility. CYFIP1-KO microglia retain the ability to differentiate but show functional deficits in synaptic engulfment.\",\n      \"method\": \"CRISPR knockout of CYFIP1 in patient-derived microglia-like cells and iPSC-derived microglia-like cells, synaptosome phagocytosis assay, morphological analysis, motility assay, multiple isogenic line pairs\",\n      \"journal\": \"Biological psychiatry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — orthogonal CRISPR constructs in multiple patient-derived cell lines with quantitative functional readouts, isogenic controls\",\n      \"pmids\": [\"37573007\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Two biallelic CYFIP1 missense variants in probands with intellectual disability and ASD are located in protein domains responsible for maintaining interactions within the WAVE regulatory complex, causing deficits in actin polymerization in patient skin fibroblasts and abnormal brain morphology and F-actin loss in Drosophila knockin mutants.\",\n      \"method\": \"Patient fibroblast actin polymerization assays, Drosophila knockin mutants for corresponding variants, brain morphology analysis in flies, behavioral assays\",\n      \"journal\": \"Biological psychiatry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — patient-derived cells with functional assay plus in vivo Drosophila knockin model, single lab\",\n      \"pmids\": [\"37704042\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CYFIP1 overexpression enhances localization of synaptic organizer neurexin 1 (NRXN1) at climbing fiber synaptic input sites on Purkinje cell primary dendrites and concomitantly enhances climbing fiber synaptic transmission (CF-EPSCs) in cerebellar Purkinje cells.\",\n      \"method\": \"CYFIP1 overexpressing mice, immunostaining for NRXN1 at climbing fiber synapses, whole-cell patch-clamp recordings of CF-EPSCs, two-photon GCaMP6f imaging of climbing fiber signals in vivo\",\n      \"journal\": \"Frontiers in cellular neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo imaging and electrophysiology in transgenic mice, single lab with two orthogonal approaches\",\n      \"pmids\": [\"37545882\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CYFIP1 (as part of the WAVE regulatory complex) is required for platelet lamellipodia formation. Platelet-specific Cyfip1 knockout mice fail to form lamellipodia on fibrinogen-coated surfaces and show enhanced spreading in structured micropatterns, demonstrating that CYFIP1-WRC-ARP2/3 axis controls platelet morphology. FAM49b (CYRI-B) negatively regulates WRC by competing for RAC1 binding, and its inhibitory effect requires functional CYFIP1-WRC.\",\n      \"method\": \"Platelet-specific Cyfip1-/-, Fam49b-/-, and double-knockout mice, platelet spreading assays on fibrinogen-coated surfaces and 2D micropatterns, morphology analysis\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-type specific KO with defined morphological phenotype in platelets, multiple genotypes tested, single lab\",\n      \"pmids\": [\"38391912\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CYFIP1 binds and stabilizes mRNAs of specific voltage-gated calcium channel subunits, explaining reduced intracellular calcium in Cyfip1-deficient cortical neurons and axons. Cyfip1 heterozygosity delays callosal axon growth and arborization in vivo, associated with impaired mitochondria morphology, activity, and motility. Elevating intracellular calcium rescues both delayed axonal growth and mitochondrial defects in Cyfip1-deficient neurons.\",\n      \"method\": \"Cyfip1 heterozygous mice (in vivo axon tracing), calcium imaging in neurons, mitochondrial morphology/motility imaging, RNA immunoprecipitation for voltage-gated calcium channel mRNAs, calcium elevation rescue experiments\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — RIP confirms direct mRNA binding, in vivo axon phenotype, calcium imaging, mitochondria assays, pharmacological rescue; multiple orthogonal methods\",\n      \"pmids\": [\"41315480\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Conditional deletion of Cyfip1 in mouse microglia reduces microglial morphological complexity and surveillance of the brain parenchyma (without affecting chemotaxis), increases CD68-positive lysosome volume, and enhances engulfment of presynapses, shifting microglia away from a homeostatic state.\",\n      \"method\": \"Conditional Cyfip1 knockout in microglia (Cre-lox), two-photon live imaging for microglial surveillance and chemotaxis, immunostaining for CD68 lysosomes, synapse engulfment assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with live imaging, multiple functional readouts (morphology, surveillance, chemotaxis, phagocytosis), in vivo\",\n      \"pmids\": [\"41818151\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CYFIP1 is a dual-function scaffold protein that acts as a translational repressor by directly binding eIF4E (mimicking 4E-BP function) within an FMRP complex, and as an activator of actin polymerization as a core subunit of the WAVE regulatory complex (WRC); active Rac1-GTP drives a conformational switch in CYFIP1 that shifts it from the translational repressor complex to the WRC, coordinating activity-dependent mRNA translation and actin dynamics at synapses, while additionally stabilizing voltage-gated calcium channel mRNAs to control intracellular calcium and axon development, regulating NMDAR complex translation, controlling synaptic E/I balance, and governing microglial morphology, surveillance, and synaptic pruning through Arp2/3-dependent actin remodeling.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CYFIP1 is a dual-function scaffold protein that couples activity-dependent mRNA translation to actin cytoskeletal remodeling, integrating these outputs at synapses and other cellular interfaces through a single Rac1-gated conformational switch [#0, #3]. It directly binds the translation initiation factor eIF4E via a domain structurally related to 4E-BP inhibitors, repressing cap-dependent translation as part of an FMRP complex; BDNF or DHPG stimulation dissociates CYFIP1 from eIF4E to license local protein synthesis [#1]. Independently, CYFIP1 is a core subunit of the WAVE regulatory complex (WRC) and binds GTP-loaded Rac1 through its N-terminal domain, co-sedimenting with F-actin to drive Arp2/3-dependent actin polymerization [#0, #8]. These two states are mutually exclusive: Rac1-GTP drives a butterfly-like conformational change that shifts CYFIP1 from the eIF4E-repressor complex into the WRC, thereby co-regulating translation and actin dynamics for proper dendritic spine morphology [#3, #7], with MNK-dependent eIF4E phosphorylation tuning the eIF4E–CYFIP1 interaction [#6]. Through these activities CYFIP1 governs synaptic structure and function — controlling dendritic complexity, AMPA receptor mobility, presynaptic release, and excitatory/inhibitory balance [#4, #10, #16] — and acts as an RNA-binding regulator that stabilizes voltage-gated calcium channel mRNAs to support axon growth and mitochondrial function [#26] and controls translation of NMDA receptor complex mRNAs [#19]. Beyond neurons, the CYFIP1-WRC-Arp2/3 axis shapes microglial morphology, surveillance, and synaptic pruning [#22, #27], regulates neural stem cell fate and white matter myelination [#17, #15], and as part of the WASF3/NCKAP1 complex suppresses cancer cell invasion and metastasis downstream of RAC1 [#2, #9]. Biallelic CYFIP1 missense variants disrupting WRC interactions cause intellectual disability and ASD with impaired actin polymerization [#23].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Established CYFIP1 as a Rac1 effector, defining its first molecular function by linking it specifically to active Rac1 signaling and the actin cytoskeleton.\",\n      \"evidence\": \"Affinity purification from brain cytosol, GST-pulldown with nucleotide-loaded GTPases, and F-actin co-sedimentation with domain mapping\",\n      \"pmids\": [\"9417078\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify CYFIP1 as a WRC subunit or define how Rac1 binding alters CYFIP1 activity\", \"No translational function known at this stage\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Revealed CYFIP1's second, unexpected function as a translational repressor that mimics 4E-BP, recasting it as a bifunctional protein bridging translation control and the FMRP pathway.\",\n      \"evidence\": \"Co-IP, in vitro binding, structural homology analysis, and BDNF/DHPG-stimulated protein synthesis after RNAi in neurons\",\n      \"pmids\": [\"18805096\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How translational repression is mechanistically reconciled with the actin/WRC role was not yet defined\", \"Identity of repressed mRNA targets not established\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrated that CYFIP1 acts as a WAVE-complex-dependent invasion suppressor, extending its actin-regulatory role into epithelial morphogenesis and tumorigenesis.\",\n      \"evidence\": \"RNAi knockdown with morphogenesis assays, in vivo Ras cooperation xenografts, and genomic deletion analysis\",\n      \"pmids\": [\"19524508\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve the molecular interface between CYFIP1 and other WRC subunits\", \"Relationship to translational function untested\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Unified the two CYFIP1 functions into a single switch model, showing Rac1-driven conformational change toggles CYFIP1 between eIF4E-repressor and WRC states to co-coordinate translation and actin dynamics.\",\n      \"evidence\": \"Intramolecular FRET, reciprocal Co-IP, interactome mass spectrometry, and CYFIP1 knockdown with spine morphology readouts in neurons\",\n      \"pmids\": [\"24050404\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the conformational switch not directly resolved at atomic level\", \"Kinetics of the switch in vivo unknown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Provided structural and regulatory detail for the switch — defining a butterfly-like conformational change, mutual exclusivity of eIF4E vs WRC binding, and MNK-dependent control of the eIF4E interaction.\",\n      \"evidence\": \"Molecular dynamics simulation grounded in the WRC crystal structure plus FRET data; reciprocal Co-IP in Mnk1/2 knockout and inhibitor-treated fibroblasts\",\n      \"pmids\": [\"26575774\", \"25588502\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"MD model and MNK regulation rest largely on a single lab each\", \"Direct atomic structure of the eIF4E-bound CYFIP1 conformation not solved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined the WASF3-NCKAP1-CYFIP1 complex as a RAC1-dependent metastasis driver, and showed disrupting subunit interfaces suppresses invasion, validating the complex as a druggable unit.\",\n      \"evidence\": \"siRNA knockdown across cancer cell lines, in vivo metastasis models, RAC1-complex Co-IP, and stapled-peptide interface disruption\",\n      \"pmids\": [\"27432794\", \"26676744\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CYFIP1's translational function contributes to invasion not addressed\", \"Specificity of peptide effects beyond the WASF3 complex not fully delimited\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Established CYFIP1 dosage as a determinant of synaptic structure and function in vivo, linking haploinsufficiency to dendritic, spine, AMPA receptor, and presynaptic phenotypes via the WRC-Rac1 axis.\",\n      \"evidence\": \"Cyfip1 heterozygous mice, shRNA with mutant rescue, single-particle AMPA receptor tracking, electrophysiology, and Rac1 inhibitor rescue\",\n      \"pmids\": [\"24667445\", \"26843638\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of translational vs actin functions to each phenotype not separated\", \"Cell-type-specific origins of presynaptic effects partly unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showed CYFIP1 and FMRP antagonistically modulate mTOR signaling and that NOTCH1 transcriptionally controls CYFIP1, situating CYFIP1 within broader growth-signaling and gene-regulatory networks.\",\n      \"evidence\": \"Drosophila NMJ and mouse olfactory neurogenesis epistasis with mTOR immunoblotting; ChIP and pathway manipulation in keratinocytes\",\n      \"pmids\": [\"28183735\", \"28410392\", \"25311365\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism connecting CYFIP1 to mTOR is indirect and not biochemically resolved\", \"NOTCH1 regulation shown in keratinocytes, not neurons\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Expanded CYFIP1's role beyond synapses to circuit-level connectivity and white matter, showing haploinsufficiency disrupts myelination and bilateral connectivity across species.\",\n      \"evidence\": \"Cyfip1 heterozygous mice and rats with fMRI/DTI, electron microscopy, MBP immunohistochemistry, and electrophysiology\",\n      \"pmids\": [\"31371726\", \"31371763\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether myelin defects are oligodendrocyte-autonomous vs axon-driven not fully resolved\", \"Molecular mechanism linking CYFIP1 to MBP distribution unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified CYFIP1 as a regulator of synaptic excitatory/inhibitory balance enriched at inhibitory postsynaptic sites, distinguishing its role from paralog CYFIP2.\",\n      \"evidence\": \"Bidirectional manipulation (overexpression and conditional knockout) with electrophysiology and immunoblotting for GABAA subunits and neuroligin 3\",\n      \"pmids\": [\"30784587\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular route by which CYFIP1 controls GABAA/neuroligin 3 levels not defined\", \"Whether effect is translational or structural unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identified specific in vivo mRNA targets of CYFIP1 — NMDAR complex and SynGAP1-associated synaptic components — and microglial/Arp2/3-dependent control of adult neurogenesis, deepening the translational-regulator and actin roles.\",\n      \"evidence\": \"RIP-seq, bidirectional genetic models with electrophysiology and pharmacological rescue; subcellular fractionation and Rac1/CaMKII activity assays; BrdU/TUNEL with Arp2/3 inhibition\",\n      \"pmids\": [\"34247782\", \"33613257\", \"34031371\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How target-mRNA selectivity is achieved not defined\", \"Some downstream signaling claims rest on single-lab correlative measurements\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defined a CYFIP1-specific interactome distinct from CYFIP2, including astrocytic focal adhesion proteins, establishing non-redundant and non-neuronal cellular contexts for CYFIP1.\",\n      \"evidence\": \"Reciprocal Co-IP from knock-in mice with mass spectrometry, size-exclusion chromatography, immunocytochemistry, and proximity ligation assay\",\n      \"pmids\": [\"35567753\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequences of focal-adhesion association not tested\", \"Whether astrocytic CYFIP1 uses WRC or translational functions unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Linked CYFIP1 directly to disease and to microglial function, showing biallelic WRC-disrupting variants cause ID/ASD and that CYFIP1 loss impairs microglial synaptic pruning and motility.\",\n      \"evidence\": \"Patient fibroblast and Drosophila knockin actin assays; CRISPR knockout in patient- and iPSC-derived microglia-like cells with phagocytosis and motility readouts\",\n      \"pmids\": [\"37704042\", \"37573007\", \"37545882\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causality of variants supported by model systems but limited human genetic replication\", \"Microglial findings in vitro; in vivo confirmation pending\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Established a new RNA-stabilization function — CYFIP1 binds and stabilizes voltage-gated calcium channel mRNAs to control intracellular calcium, axon growth, and mitochondrial health.\",\n      \"evidence\": \"RIP, calcium imaging, in vivo axon tracing, mitochondrial imaging, and calcium-elevation rescue in Cyfip1 heterozygous neurons\",\n      \"pmids\": [\"41315480\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism distinguishing mRNA stabilization from translational repression not resolved\", \"Whether stabilization requires the WRC or eIF4E conformations unknown\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Confirmed in vivo microglial roles, showing CYFIP1 maintains microglial surveillance, morphological complexity, and homeostatic state while restraining presynapse engulfment.\",\n      \"evidence\": \"Conditional microglial Cyfip1 knockout with two-photon live imaging, CD68 lysosome immunostaining, and synapse engulfment assays\",\n      \"pmids\": [\"41818151\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether engulfment phenotype is WRC/Arp2/3-mediated not directly demonstrated in this model\", \"Circuit-level consequences of altered pruning not assessed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how CYFIP1 selects between its mutually exclusive translational-repressor, mRNA-stabilizing, and WRC actin-nucleating functions in a given cell type and whether a single molecular hierarchy governs all phenotypes.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying quantitative model partitioning translation vs actin functions across cell types\", \"Atomic structure of the eIF4E-bound conformation unsolved\", \"Mechanism of target-mRNA recognition undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0045182\", \"supporting_discovery_ids\": [1, 6, 19]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [19, 26]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0, 2]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1, 8]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [3, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 25]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0, 4]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [3, 4, 16, 19]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [1, 6, 19]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 3, 7]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [14, 15, 17, 26]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [2, 9, 23]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [22, 27]}\n    ],\n    \"complexes\": [\n      \"WAVE regulatory complex (WRC)\",\n      \"FMRP-eIF4E translational repressor complex\",\n      \"WASF3-NCKAP1-CYFIP1 complex\"\n    ],\n    \"partners\": [\n      \"RAC1\",\n      \"EIF4E\",\n      \"FMR1\",\n      \"WASF3\",\n      \"NCKAP1\",\n      \"GAS7\",\n      \"FAM49B\",\n      \"NRXN1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}