{"gene":"CYFIP2","run_date":"2026-06-09T22:57:19","timeline":{"discoveries":[{"year":2003,"finding":"PIR121 (CYFIP2 ortholog in Dictyostelium) directly binds Rac and is required for proper SCAR/WAVE activity; genetic epistasis (pirA deletion in scar-null background) demonstrated that PIR121 acts primarily through SCAR in vivo. pirA-null cells show hyperactive SCAR phenotype consistent with PIR121 functioning as an inhibitor of SCAR in the absence of activating signals.","method":"Gene disruption, genetic epistasis (double mutant pirA-/scar-), actin polymerization assays, immunoblot for SCAR protein levels","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with double mutant rescue, multiple orthogonal phenotypic readouts, replicated in a model organism with clear functional consequence","pmids":["12956949"],"is_preprint":false},{"year":2004,"finding":"CYFIP2 overexpression increases fibronectin-mediated adhesion in Jurkat T cells, and CYFIP2 knockdown reduces fibronectin-mediated adhesion in Jurkat and primary CD4+ T cells; this adhesion function depends on the Rac-1/WAVE1 pathway, as inhibition of Rac-1 phenocopies CYFIP2 reduction.","method":"Adenoviral overexpression, antisense oligodeoxynucleotide knockdown, fibronectin adhesion assays, Rac-1 inhibition","journal":"European journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain-of-function and loss-of-function experiments with functional readout, single lab, two orthogonal perturbation methods","pmids":["15048733"],"is_preprint":false},{"year":2007,"finding":"CYFIP2 is a direct transcriptional target of p53: the CYFIP2 promoter contains a p53-responsive element that confers p53 binding and transcriptional activation. Inducible CYFIP2 expression alone is sufficient to activate caspases and induce apoptosis. CYFIP2 protein subcellular localization is sensitive to leptomycin-B (CRM-1/exportin inhibitor), indicating nucleocytoplasmic shuttling.","method":"Promoter reporter assays, p53 binding assay, inducible overexpression with caspase activity and apoptosis readout, leptomycin-B treatment with localization analysis","journal":"Cell cycle (Georgetown, Tex.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter binding + reporter assay + functional apoptosis readout, single lab, multiple orthogonal methods","pmids":["17245118"],"is_preprint":false},{"year":2010,"finding":"CYFIP/PIR121-containing complexes coordinate Arf1 and Rac1 signaling at the TGN: Arf1 GTPase recruits clathrin-AP-1 coats and CYFIP-containing complexes to the TGN; Rac1 and its exchange factor β-PIX then activate these complexes to drive N-WASP- and Arp2/3-dependent actin polymerization, promoting tubule formation for clathrin-AP-1-coated carrier biogenesis.","method":"Co-immunoprecipitation, synthetic membrane reconstitution, siRNA knockdown, live imaging, biochemical fractionation","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution on synthetic membranes plus multiple orthogonal biochemical and imaging methods in a single rigorous study","pmids":["20228810"],"is_preprint":false},{"year":2010,"finding":"CYFIP2 (encoded by the nevermind locus) is required cell-autonomously for dorso-ventral topographic sorting of dorsonasal retinal ganglion cell axons in the zebrafish optic tract, and is also required cell-nonautonomously for proper retinal lamination.","method":"Forward genetic screen, positional cloning, cell-autonomous rescue via mosaic analysis, axon tracing","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function with mosaic rescue demonstrating cell autonomy, replicated phenotypic analysis across multiple axon tracts","pmids":["20537992"],"is_preprint":false},{"year":2011,"finding":"CYFIP2 knockdown rescues IMP-1-knockdown-induced caspase-3- and PARP-mediated apoptosis in SW480 colon cancer cells, placing CYFIP2 downstream of IMP-1 in a K-Ras-linked pro-apoptotic pathway. CYFIP2 mRNA is upregulated upon IMP-1 loss, consistent with its role as a p53-inducible proapoptotic gene.","method":"RNA interference knockdown, RNA microarray, RT-PCR validation, caspase-3/PARP apoptosis assays, epistasis rescue experiment","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis rescue experiment with defined apoptotic readout, single lab, multiple orthogonal methods","pmids":["21252116"],"is_preprint":false},{"year":2016,"finding":"Reduced CYFIP2 expression in heterozygous null mice increases APP and BACE1 protein (but not mRNA) levels, elevates Aβ42 production, increases α-CaMKII protein expression leading to tau hyperphosphorylation at Ser-214, impairs dendritic spine maturity in CA1 pyramidal neurons, and prevents retention of spatial memory. This positions CYFIP2 as a translational regulator of APP and CaMKII at synapses.","method":"Cyfip2 heterozygous knockout mice, immunoblot, ELISA for Aβ42, immunohistochemistry, dendritic spine morphology analysis, Morris water maze","journal":"Brain : a journal of neurology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo knockout with multiple orthogonal molecular and behavioral readouts establishing mechanistic cascade in single rigorous study","pmids":["27524794"],"is_preprint":false},{"year":2018,"finding":"De novo missense variants at CYFIP2 Arg87 (interface with WAVE1 in the WRC) disrupt hydrogen bonding between CYFIP2 and WAVE1, weaken CYFIP2–VCA domain interaction, and cause speckled ectopic accumulation of actin and CYFIP2 in transfected cells, consistent with gain-of-function WRC activation.","method":"Computational structural analysis, in vitro transfection, immunofluorescence of actin and CYFIP2 distribution, co-immunoprecipitation of mutant vs. WT CYFIP2 with VCA domain","journal":"Annals of neurology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — structural modeling plus in vitro functional validation, single lab, two orthogonal approaches","pmids":["29534297"],"is_preprint":false},{"year":2018,"finding":"CYFIP2 mediates contact-triggered fasciculation and repulsion responses between dorsal and ventral retinal ganglion cell axons and is specifically required for optic tract topographic sorting. CYFIP2 associates with transporting ribonucleoprotein particles and, upon axon-axon contact, translocates into growth cones to join the WAVE regulatory complex in the periphery, regulating actin remodeling and filopodial dynamics. The function in axon sorting is mediated by WRC binding, not translational regulation.","method":"In vivo knockdown/knockout in Xenopus RGCs, live imaging, fractionation, co-immunoprecipitation, FRAP, dominant-negative WRC binding mutant rescue","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods including live imaging, co-IP, and functional domain rescue in a single rigorous study","pmids":["29518358"],"is_preprint":false},{"year":2018,"finding":"Cyfip2 establishes the innate acoustic startle threshold by reducing neural activity in a defined set of excitatory hindbrain interneurons, acting independently of FMRP. Reactivation of cyfip2 after phenotype onset restores the baseline startle threshold.","method":"Forward genetic screen, whole-genome sequencing, conditional transgenic rescue, neural circuit calcium imaging, genetic epistasis with fmrp mutants","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — forward genetic identification, conditional temporal rescue, circuit-level functional imaging, epistasis, single rigorous study with multiple methods","pmids":["29669291"],"is_preprint":false},{"year":2019,"finding":"De novo CYFIP2 missense variants cluster spatially in the tertiary structure at interfaces with WAVE1 and NCKAP1 of the WRC, with structural modeling predicting weakened WRC interactions. A splice-donor variant causes exon skipping and a truncated protein that likely escapes NMD.","method":"Trio whole-exome/genome sequencing, 3D structural modeling, RT-PCR validation of exon skipping","journal":"European journal of human genetics : EJHG","confidence":"Low","confidence_rationale":"Tier 4 / Moderate — structural prediction without in vitro functional validation; RT-PCR for splicing is supportive but limited mechanistic depth","pmids":["30664714"],"is_preprint":false},{"year":2020,"finding":"Seven of eight intellectual-disability-causing CYFIP2 missense variants promote WRC activation in CRISPR/Cas9-engineered B16-F1 cells reconstituted with mutant CYFIP2. The majority of mutations occur in the WAVE-binding region required for WRC trans-inhibition; one mutation near the Rac-binding A-site eases Rac-mediated WRC activation. A truncating variant is a loss-of-function that fails to interact with WRC components.","method":"CRISPR/Cas9 cell line engineering, reconstitution with CYFIP2 variants, lamellipodia/WRC activation assays, co-immunoprecipitation","journal":"Cells","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution in engineered cells with multiple variants tested, mechanistic dissection of two distinct gain-of-function mechanisms plus identification of loss-of-function variant","pmids":["32486060"],"is_preprint":false},{"year":2020,"finding":"Structural modeling of CYFIP2 missense variants predicts disruption of interactions within the WRC or impaired CYFIP2 stability; patient-derived fibroblasts from six CYFIP2 variant carriers show aberrant WRC-mediated actin polymerization, substantiating WRC dysfunction as a cellular pathomechanism.","method":"Structural modeling, actin polymerization assays in patient fibroblasts","journal":"Genetics in medicine : official journal of the American College of Medical Genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — patient fibroblast functional assay plus structural modeling, single study, two complementary but not fully orthogonal approaches","pmids":["33149277"],"is_preprint":false},{"year":2020,"finding":"CYFIP2 interactome in neonatal mouse forebrain (isolated via Cyfip2-3xFlag knock-in) contains 140 proteins including WRC actin regulators and 25 RNA-binding proteins including Argonaute proteins. Brain-disorder-associated CYFIP2 R87 variants (but not WT) inhibit stress granule formation and form intracellular clusters with Argonaute proteins under basal and stress conditions.","method":"Cyfip2-3xFlag knock-in mice, immunoprecipitation, mass spectrometry, overexpression of WT vs. mutant CYFIP2, immunofluorescence of stress granules and Argonaute","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo knock-in IP/MS interactome plus functional validation with two orthogonal readouts (stress granule formation, Argonaute co-clustering)","pmids":["32560809"],"is_preprint":false},{"year":2020,"finding":"Haploinsufficiency of Cyfip2 in mice increases filamentous actin, enlarges dendritic spines, and enhances excitatory synaptic transmission and intrinsic excitability specifically in layer 5 prefrontal cortex neurons. These layer-5-specific prefrontal defects are associated with increased seizure susceptibility and abnormal cortical auditory steady-state responses. Virus-mediated selective reduction of CYFIP2 in the PFC is sufficient to induce L5 hyperexcitability.","method":"Cyfip2+/- mice, electrophysiology (patch-clamp, EEG), electron microscopy of dendritic spines, F-actin staining, viral vector injection, RNA sequencing","journal":"Annals of neurology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo KO plus viral KD with multiple orthogonal electrophysiological, morphological, and molecular readouts in one study","pmids":["32562430"],"is_preprint":false},{"year":2020,"finding":"Cyfip2 heterozygous mice show enhanced presynaptic short-term plasticity upon high-frequency stimulation and a reduced number (but not volume or cristae density) of mitochondria in presynaptic boutons and axonal processes of mPFC layer 5. CYFIP2 is biochemically detected in a mitochondria-enriched fraction, and mitochondrial proteins were identified in the CYFIP2 interactome.","method":"Cyfip2+/- mice, patch-clamp electrophysiology, electron microscopy, biochemical fractionation, interactome cross-reference","journal":"Molecular brain","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo KO with electrophysiology plus EM plus fractionation, single lab, multiple orthogonal readouts","pmids":["32917241"],"is_preprint":false},{"year":2021,"finding":"NUAK2 directly binds CYFIP2 (demonstrated by co-immunoprecipitation), and NUAK2 silencing upregulates CYFIP2 expression; CYFIP2 knockdown reverses the anti-proliferative and anti-migratory effects of NUAK2 silencing in cervical cancer cells, placing CYFIP2 downstream of NUAK2.","method":"Co-immunoprecipitation, siRNA knockdown, proliferation/migration/invasion assays, western blotting","journal":"Molecular medicine reports","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single Co-IP plus epistasis rescue, single lab, two orthogonal perturbation approaches","pmids":["34558636"],"is_preprint":false},{"year":2022,"finding":"The p.Arg87Cys variant enhances ubiquitination and proteasomal degradation of CYFIP2 protein, resulting in decreased CYFIP2 levels in Cyfip2+/R87C knock-in mouse brains. Cyfip2+/R87C mice recapitulate West syndrome phenotypes including spasm-like movements, microcephaly, impaired social communication, hippocampal cytoarchitectural disorganization, and gliosis.","method":"Cyfip2+/R87C knock-in mice, ubiquitination assay, proteasome inhibitor treatment, western blotting, behavioral and histological analyses","journal":"Annals of neurology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo knock-in model with direct ubiquitination assay and proteasome inhibitor rescue, establishing the molecular degradation mechanism","pmids":["36251395"],"is_preprint":false},{"year":2022,"finding":"CYFIP1 and CYFIP2 form largely non-overlapping interactomes in the mouse brain (only 8 common proteins out of 131 CYFIP1 and 140 CYFIP2 interactors). CYFIP1 and CYFIP2 do not significantly co-immunoprecipitate each other. CYFIP2 is detected only in neurons, while CYFIP1 is detected in both neurons and astrocytes, and CYFIP1 specifically associates with astrocytic focal adhesion proteins.","method":"Reciprocal co-IP using CYFIP1-2xMyc and CYFIP2-3xFlag knock-in mice, mass spectrometry, size-exclusion chromatography, immunohistochemistry, proximity ligation assay","journal":"Journal of neurochemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP with knock-in mice, mass spectrometry, multiple orthogonal localization methods; CYFIP2-specific findings are well-supported","pmids":["35567753"],"is_preprint":false},{"year":2022,"finding":"Loss of CYFIP2 in 3T3-L1 adipocytes induces browning of white adipocytes via activation of mTORC1 and suppression of GABA-BR signaling, independently promoting thermogenic gene expression (PGC-1α, PRDM16, UCP1) and mitochondrial biogenesis.","method":"siRNA knockdown in 3T3-L1 adipocytes, qRT-PCR, immunoblot, mTORC1 and GABA-BR pathway inhibitor experiments","journal":"Journal of cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with pathway inhibitor dissection, single lab, two independent pathway analyses","pmids":["35233844"],"is_preprint":false},{"year":2024,"finding":"CYFIP2 deficiency in embryonic mouse forebrains alters levels of 278 proteins, including WRC components and numerous membraneless organelle (MLO)-associated proteins (nucleolus, stress granules, processing bodies). CYFIP2 knockdown suppresses eIF2α phosphorylation levels, thereby enhancing protein synthesis, through a WRC-dependent actin regulation mechanism.","method":"Cyfip2-knockout embryonic mice, quantitative proteomics, single-cell transcriptomics, MLO morphology imaging, eIF2α phosphorylation assay in CYFIP2 knockdown cells","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo KO proteomics plus mechanistic eIF2α assay in KD cells, single lab, multiple orthogonal approaches","pmids":["38981622"],"is_preprint":false},{"year":2025,"finding":"CYFIP2 RNA editing (A-to-I by ADAR enzymes) at codon 320 (K320E substitution) has distinct functional consequences: CYFIP2-KO neuroblastoma cells show actin disorganization and failure to differentiate; re-expression of the edited (E) isoform increases axon branch number, total axon length, and dendritic spine frequency more than the unedited (K) isoform in primary neurons with CYFIP2 knockdown.","method":"CRISPR-Cas9 CYFIP2 knockout, shRNA knockdown, overexpression of K vs. E isoforms, actin imaging, axon morphometry, dendritic spine quantification in primary neurons","journal":"Neurochemistry international","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function plus isoform-specific rescue with multiple morphological readouts, single lab","pmids":["41203017"],"is_preprint":false},{"year":2025,"finding":"ELK3 directly suppresses CYFIP2 transcription in triple-negative breast cancer cells; loss of CYFIP2 downstream of ELK3 promotes filopodia-mediated migration/adhesion and reduces sensitivity to NK cell-mediated killing by modulating actin accumulation at NK cell contact sites.","method":"RNA-sequencing, ChIP or promoter analysis for ELK3-CYFIP2 direct regulation, siRNA/overexpression, confocal imaging of actin at NK cell contacts, flow cytometry of NK killing","journal":"Journal of experimental & clinical cancer research : CR","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — molecular validation of ELK3 direct suppression of CYFIP2 with functional actin and NK cell readouts, single lab","pmids":["39930469"],"is_preprint":false},{"year":2024,"finding":"Cyfip2 controls the acoustic startle threshold through both Rac1 and FMRP pathways (but not FXR1 or FXR2). Cyfip2 acts acutely to maintain the startle threshold through branched actin polymerization and NMDARs. Loss of Cyfip2 alters cytoskeletal/ECM components, disrupts oxidative phosphorylation and GABA receptor signaling; pharmacological activation of GABAB receptors restores normal startle sensitivity in cyfip2 mutants.","method":"Conditional transgenic rescue, CRISPR/Cas9, drug screen, discovery proteomics, GABAB receptor agonist rescue","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional rescue plus proteomics plus pharmacological validation, single lab, preprint not peer-reviewed","pmids":["38187577"],"is_preprint":true},{"year":2025,"finding":"Cyfip2 acts through Rac1-dependent actin polymerization (not FMRP-mediated translation) during a critical developmental window (30–50 hpf) to establish visual sensorimotor circuits in zebrafish. cyfip2 mutants show reduced spontaneous and stimulus-evoked neuronal activity in the optic tectum consistent with impaired RGC functional input.","method":"Conditional transgenic temporal rescue, CRISPR/Cas9, phospho-ERK immunostaining, pan-neuronal calcium imaging, behavioral assays (prey capture, flash response, OKR)","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional temporal rescue with circuit-level imaging and pathway epistasis, single lab, preprint not peer-reviewed","pmids":["41509276"],"is_preprint":true},{"year":2025,"finding":"Extracellular vesicle (EV)-dependent secretion controls intracellular CYFIP2 protein homeostasis in cortical neurons: pharmacological and genetic blockade of EV release elevates intracellular CYFIP2, glutamate-evoked EV release reduces CYFIP2 levels, and Fmr1 KO neurons secrete fewer EVs with concomitantly elevated CYFIP2. Evoking EV release in FXS neurons normalizes intracellular CYFIP2.","method":"EV pharmacological/genetic blockade, glutamate stimulation, proteomic analysis of EV cargo, Fmr1 KO mouse neurons, immunoblot","journal":"Biomedicines","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple pharmacological and genetic perturbations with quantitative protein-level readouts, single lab","pmids":["41153799"],"is_preprint":false},{"year":2026,"finding":"CYFIP2 is required for embryonic phrenic nerve axon development and diaphragm NMJ formation: Cyfip2-null embryos (E16.5) show reduced phrenic nerve axon length and branching, increased endplate bandwidth in sparse AChR regions, and reduced pre- and post-synaptic puncta density with decreased colocalization, demonstrating a peripheral nervous system role for CYFIP2.","method":"Cyfip2-null embryonic mice, immunofluorescence (synaptophysin, α-bungarotoxin), morphometric analysis of axon length/branching and NMJ organization","journal":"Molecular brain","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo knockout with multiple orthogonal morphological readouts, single study, single lab","pmids":["42035098"],"is_preprint":false},{"year":2026,"finding":"CYFIP2 and p53 form a positive feedback loop that promotes renal fibrosis by inhibiting the Hippo pathway and enhancing YAP nuclear translocation in tubular epithelial cells. Tubule-specific CYFIP2 deletion attenuates hypertension-induced cellular senescence (reduced SA-β-gal, p53/p21, SASP; increased Klotho) and mitigates renal dysfunction. The p53 agonist Nutlin-3a reverses protection from CYFIP2 KO.","method":"Tubule-specific Cyfip2 knockout mice (DOCA/salt hypertension model), co-immunoprecipitation/interaction assay for CYFIP2-p53, YAP nuclear translocation imaging, SA-β-gal assay, Nutlin-3a rescue, siRNA in HK-2 cells","journal":"Acta pharmacologica Sinica","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-type-specific in vivo KO plus pharmacological rescue establishing CYFIP2/p53-Hippo/YAP axis, single lab","pmids":["42098400"],"is_preprint":false}],"current_model":"CYFIP2 is an evolutionarily conserved component of the WAVE regulatory complex (WRC) that inhibits WAVE/SCAR in the absence of activating signals by binding directly to Rac GTPase; upon Rac1 activation or axon-axon contact stimulation, CYFIP2 releases trans-inhibition of the WRC to drive Arp2/3-dependent actin polymerization, regulating lamellipodia, filopodia, dendritic spine morphology, and axon sorting. In neurons it also shuttles between ribonucleoprotein particles and the actin-nucleating WRC periphery, regulating local mRNA translation, stress granule dynamics, and eIF2α phosphorylation. CYFIP2 is a direct p53 transcriptional target that triggers caspase-dependent apoptosis when overexpressed, and its stability is controlled by ubiquitin-proteasome degradation (enhanced by the disease-linked R87C variant) and by extracellular vesicle-dependent secretion. Disease-associated hotspot variants (especially at Arg87) predominantly gain function by weakening the CYFIP2–WAVE1 interface and constitutively activating the WRC, while truncating variants represent loss-of-function alleles that fail to incorporate into the WRC."},"narrative":{"mechanistic_narrative":"CYFIP2 is an evolutionarily conserved component of the WAVE regulatory complex (WRC) that holds WAVE/SCAR-driven Arp2/3-dependent actin polymerization in a trans-inhibited state until relieved by Rac signaling, a function first established for its Dictyostelium ortholog PIR121, which binds Rac directly and acts as a SCAR inhibitor whose loss yields hyperactive SCAR [PMID:12956949]. In neurons, CYFIP2 associates with transporting ribonucleoprotein particles and translocates into growth cones upon axon-axon contact to join the WRC at the periphery, where it controls actin remodeling and filopodial dynamics to drive contact-triggered fasciculation, repulsion, and topographic axon sorting in a WRC-binding-dependent manner [PMID:29518358, PMID:20537992]. This WRC-coupled actin control shapes dendritic spine morphology, synaptic transmission, and circuit excitability: Cyfip2 haploinsufficiency increases filamentous actin, enlarges spines, and produces layer-5 prefrontal hyperexcitability and seizure susceptibility [PMID:32562430], and Cyfip2 sets the innate acoustic startle threshold through branched actin polymerization [PMID:29669291]. Beyond actin, CYFIP2 functions as a translational regulator, controlling synaptic levels of APP and CaMKII protein independent of transcript [PMID:27524794] and suppressing eIF2α phosphorylation to modulate protein synthesis through WRC-dependent actin regulation [PMID:38981622], while interactome analysis places it with both WRC actin regulators and Argonaute-containing RNA-binding machinery and links it to stress granule dynamics [PMID:32560809]. CYFIP2 is a direct p53 transcriptional target whose induction is sufficient to activate caspases and trigger apoptosis [PMID:17245118], and its protein abundance is tuned by ubiquitin-proteasome degradation and by extracellular-vesicle-dependent secretion [PMID:36251395, PMID:41153799]. Disease-associated de novo missense variants cluster at the CYFIP2–WAVE1 interface—the Arg87 hotspot being prototypical—and predominantly act as gain-of-function alleles that weaken trans-inhibition and constitutively activate the WRC, whereas truncating variants are loss-of-function alleles that fail to incorporate into the complex [PMID:29534297, PMID:32486060]; the R87C variant additionally destabilizes CYFIP2 via enhanced ubiquitination and recapitulates West syndrome in knock-in mice [PMID:36251395].","teleology":[{"year":2003,"claim":"Established the founding biochemical logic of CYFIP2/PIR121 as a Rac-binding negative regulator of SCAR/WAVE, answering whether it activates or restrains actin nucleation.","evidence":"Gene disruption and pirA-/scar- double-mutant epistasis with actin assays in Dictyostelium","pmids":["12956949"],"confidence":"High","gaps":["Did not resolve mammalian WRC architecture or the structural basis of trans-inhibition","Mechanism of Rac-triggered relief not defined at this stage"]},{"year":2004,"claim":"Connected CYFIP2 to integrin-based adhesion through the Rac1/WAVE1 pathway, extending its actin-regulatory role to a defined cellular behavior in T cells.","evidence":"Adenoviral overexpression and antisense knockdown with fibronectin adhesion assays plus Rac1 inhibition in Jurkat and primary CD4+ T cells","pmids":["15048733"],"confidence":"Medium","gaps":["Direct biochemical demonstration of CYFIP2 in the T-cell WRC not shown","Single lab"]},{"year":2007,"claim":"Revealed a transcriptional/pro-apoptotic identity distinct from actin regulation by showing CYFIP2 is a direct p53 target sufficient to trigger caspase-dependent apoptosis.","evidence":"p53 promoter binding and reporter assays, inducible overexpression with caspase/apoptosis readouts, leptomycin-B localization analysis","pmids":["17245118"],"confidence":"Medium","gaps":["Molecular effectors linking CYFIP2 to caspase activation not identified","Relationship between nucleocytoplasmic shuttling and WRC function unresolved"]},{"year":2010,"claim":"Demonstrated cell-autonomous and non-autonomous in vivo developmental roles, establishing CYFIP2 as required for retinal ganglion cell axon sorting and lamination, and showed CYFIP-complex coupling of Arf1/Rac1 signaling at the TGN.","evidence":"Zebrafish forward genetics with mosaic rescue and axon tracing; co-IP, synthetic membrane reconstitution and imaging at the TGN","pmids":["20537992","20228810"],"confidence":"High","gaps":["Molecular distinction between CYFIP2 actin and translational outputs not yet separated","TGN study used CYFIP/PIR121 complexes broadly rather than CYFIP2 specifically"]},{"year":2016,"claim":"Defined CYFIP2 as a synaptic translational regulator by showing haploinsufficiency raises APP, BACE1 and CaMKII protein without mRNA change, linking it to spine maturation and memory.","evidence":"Cyfip2 heterozygous mice with immunoblot, Aβ42 ELISA, spine morphology, and Morris water maze","pmids":["27524794"],"confidence":"High","gaps":["Direct mechanism of CYFIP2 control over specific transcript translation not defined","Whether this acts via WRC or RNP machinery unresolved"]},{"year":2018,"claim":"Resolved how CYFIP2 toggles between RNP and WRC functions in neurons and showed axon sorting depends on WRC binding rather than translational regulation, while genetic work defined an FMRP-independent circuit role.","evidence":"Xenopus RGC knockdown, live imaging, fractionation, co-IP, FRAP and dominant-negative WRC-binding rescue; zebrafish forward genetics with conditional rescue and circuit calcium imaging","pmids":["29518358","29669291"],"confidence":"High","gaps":["Signal that triggers RNP-to-WRC translocation not molecularly identified","Cargo mRNAs of CYFIP2-RNP particles not enumerated"]},{"year":2018,"claim":"Provided the first mechanistic basis for disease variants, showing Arg87 substitutions disrupt the CYFIP2–WAVE1/VCA interface to cause gain-of-function WRC activation.","evidence":"Structural modeling, transfection with actin/CYFIP2 immunofluorescence, and co-IP of mutant versus WT with VCA domain","pmids":["29534297"],"confidence":"Medium","gaps":["Quantitative WRC activation in physiological context not measured","Generalizability beyond Arg87 not tested here"]},{"year":2019,"claim":"Mapped the spatial clustering of de novo variants at WRC interfaces (WAVE1, NCKAP1) and identified a splice variant predicting a truncated protein.","evidence":"Trio exome/genome sequencing, 3D structural modeling, RT-PCR of exon skipping","pmids":["30664714"],"confidence":"Low","gaps":["Structural prediction without in vitro functional validation","NMD escape and truncated protein behavior inferred not demonstrated"]},{"year":2020,"claim":"Systematically distinguished gain-of-function from loss-of-function disease mechanisms, showing most variants activate the WRC by impairing trans-inhibition while truncating variants fail to incorporate, and confirmed WRC dysfunction in patient cells.","evidence":"CRISPR/Cas9 reconstitution in B16-F1 cells with WRC activation assays and co-IP; patient fibroblast actin polymerization assays with structural modeling","pmids":["32486060","33149277"],"confidence":"High","gaps":["In vivo consequences of constitutive WRC activation in neurons not addressed in cell models","One variant near the Rac A-site implies a second activation mechanism not fully dissected"]},{"year":2020,"claim":"Defined CYFIP2's brain interactome and circuit-level synaptic functions, linking it to WRC and Argonaute/RNA-binding proteins, prefrontal layer-5 hyperexcitability, presynaptic plasticity, and mitochondrial associations.","evidence":"Cyfip2-3xFlag knock-in IP/MS interactome with stress granule and Argonaute imaging; Cyfip2+/- electrophysiology, EM, F-actin staining, viral knockdown, RNA-seq, and mitochondrial fractionation","pmids":["32560809","32562430","32917241"],"confidence":"High","gaps":["Direct role of CYFIP2 at mitochondria versus indirect association unresolved","Causal link between Argonaute co-clustering and translational output not established"]},{"year":2022,"claim":"Established CYFIP2 protein homeostasis as a disease mechanism and clarified the divergence from its paralog, showing R87C destabilizes CYFIP2 via ubiquitin-proteasome degradation to model West syndrome, while CYFIP1 and CYFIP2 form largely non-overlapping interactomes and do not associate.","evidence":"Cyfip2+/R87C knock-in mice with ubiquitination and proteasome-inhibitor assays and behavior; reciprocal co-IP knock-in mice with mass spectrometry, SEC, IHC and PLA","pmids":["36251395","35567753"],"confidence":"High","gaps":["E3 ligase mediating CYFIP2 ubiquitination not identified","How reduced abundance reconciles with gain-of-function WRC activation for R87C not fully integrated"]},{"year":2024,"claim":"Linked CYFIP2 to translational control of the integrated stress response, showing it suppresses eIF2α phosphorylation through WRC-dependent actin regulation and influences membraneless organelle proteomes.","evidence":"Cyfip2-knockout embryonic mouse proteomics, single-cell transcriptomics, MLO imaging, and eIF2α phosphorylation assay in knockdown cells","pmids":["38981622"],"confidence":"Medium","gaps":["Mechanistic bridge from actin regulation to eIF2α kinase/phosphatase activity not defined","Specific transcripts whose synthesis is affected not identified"]},{"year":2025,"claim":"Extended CYFIP2 regulation to extracellular-vesicle secretion and RNA editing, and broadened its roles into cancer cell migration/immune evasion and adipocyte browning.","evidence":"EV blockade and glutamate stimulation with Fmr1 KO neurons and EV proteomics; ADAR-edited K320E isoform rescue in neurons; ELK3 promoter suppression with NK-killing assays; siRNA in 3T3-L1 adipocytes with mTORC1/GABA-BR dissection","pmids":["41153799","41203017","39930469","35233844"],"confidence":"Medium","gaps":["Functional consequence of editing isoform balance in vivo unclear","How EV secretion integrates with proteasomal control of CYFIP2 abundance unresolved"]},{"year":2026,"claim":"Expanded CYFIP2 functions into peripheral nervous system development and non-neuronal disease, demonstrating roles in phrenic nerve/NMJ formation and a CYFIP2–p53 feedback loop driving renal fibrosis via Hippo/YAP.","evidence":"Cyfip2-null embryonic mouse NMJ morphometry; tubule-specific Cyfip2 KO hypertension model with CYFIP2-p53 co-IP, YAP imaging, senescence assays, and Nutlin-3a rescue","pmids":["42035098","42098400"],"confidence":"Medium","gaps":["Whether peripheral NMJ phenotype is WRC-dependent not tested","Direct mode of CYFIP2-p53 physical interaction and its relation to actin function unresolved"]},{"year":null,"claim":"It remains unresolved how CYFIP2 mechanistically partitions its three documented activities—WRC trans-inhibition, RNP-associated translational control, and p53-linked apoptotic/transcriptional signaling—and what molecular signals route the same protein between these distinct pools.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model integrating WRC binding with RNP/translational roles","Signals governing RNP-to-WRC switching unidentified","E3 ligase and full regulatory logic of CYFIP2 abundance unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,8,11]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[0,8,14]},{"term_id":"GO:0045182","term_label":"translation regulator activity","supporting_discovery_ids":[6,20]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[13,8]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[8,11]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[8,13]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[8,14,21]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[2]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[15]}],"pathway":[{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[4,8,26]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[6,9,14]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[6,20]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[2,5]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[7,11,17]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,3]}],"complexes":["WAVE regulatory complex (WRC)"],"partners":["WASF1","NCKAP1","RAC1","ARF1","AGO","TP53","NUAK2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q96F07","full_name":"Cytoplasmic FMR1-interacting protein 2","aliases":["p53-inducible protein 121"],"length_aa":1278,"mass_kda":148.4,"function":"Involved in T-cell adhesion and p53/TP53-dependent induction of apoptosis. 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Part A","url":"https://pubmed.ncbi.nlm.nih.gov/37975178","citation_count":2,"is_preprint":false},{"pmid":"37646972","id":"PMC_37646972","title":"Generation of an induced pluripotent stem cell line from a patient with epileptic encephalopathy caused by the CYFIP2 R87C variant.","date":"2023","source":"Human cell","url":"https://pubmed.ncbi.nlm.nih.gov/37646972","citation_count":2,"is_preprint":false},{"pmid":"38540093","id":"PMC_38540093","title":"Identification of CYFIP2 Arg87Cys Ligands via In Silico and In Vitro Approaches.","date":"2024","source":"Biomedicines","url":"https://pubmed.ncbi.nlm.nih.gov/38540093","citation_count":1,"is_preprint":false},{"pmid":"41153799","id":"PMC_41153799","title":"Extracellular Vesicles-Dependent Secretion Regulates Intracellular CYFIP2 Protein Homeostasis in Cortical Neurons.","date":"2025","source":"Biomedicines","url":"https://pubmed.ncbi.nlm.nih.gov/41153799","citation_count":1,"is_preprint":false},{"pmid":"39511293","id":"PMC_39511293","title":"Elucidating the role of CYFIP2 in conferring cisplatin resistance in esophageal squamous cell carcinoma.","date":"2024","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/39511293","citation_count":1,"is_preprint":false},{"pmid":"37356964","id":"PMC_37356964","title":"Cyfip2 allelic variation in C57BL/6J and C57BL/6NJ mice alters free-choice ethanol drinking but not binge-like drinking or wheel-running activity.","date":"2023","source":"Alcohol, clinical & experimental research","url":"https://pubmed.ncbi.nlm.nih.gov/37356964","citation_count":1,"is_preprint":false},{"pmid":"39667565","id":"PMC_39667565","title":"Epigallocatechin gallate ameliorates retinal pigment epithelial cell damage via the CYFIP2 /AKT pathway.","date":"2024","source":"Toxicology and applied pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/39667565","citation_count":1,"is_preprint":false},{"pmid":"40425513","id":"PMC_40425513","title":"Novel CYFIP2 Frameshift Variant Linked to Dyskinetic Crises: Functional Studies Show Impaired Cell Motility.","date":"2025","source":"Clinical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/40425513","citation_count":0,"is_preprint":false},{"pmid":"41509276","id":"PMC_41509276","title":"Cyfip2 mediates sensorimotor integration of visual input through Rac1-dependent actin remodeling.","date":"2025","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/41509276","citation_count":0,"is_preprint":false},{"pmid":"42098400","id":"PMC_42098400","title":"CYFIP2 deficiency ameliorates renal interstitial fibrosis through attenuating tubular senescence in hypertensive nephropathy.","date":"2026","source":"Acta pharmacologica Sinica","url":"https://pubmed.ncbi.nlm.nih.gov/42098400","citation_count":0,"is_preprint":false},{"pmid":"42035098","id":"PMC_42035098","title":"Impaired phrenic nerve axon development and diaphragm neuromuscular junction formation in embryonic Cyfip2-null mice.","date":"2026","source":"Molecular brain","url":"https://pubmed.ncbi.nlm.nih.gov/42035098","citation_count":0,"is_preprint":false},{"pmid":"41851324","id":"PMC_41851324","title":"Impact of the CYFIP2 R87C variant in a human neuronal model in vitro.","date":"2026","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/41851324","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.05.06.652352","title":"Longitudinal deep phenotyping in a mouse model of West syndrome reveals temporal dynamics of synapse remodeling, gliosis, and proteomic and lipidomic changes during seizure evolution","date":"2025-05-10","source":"bioRxiv","url":"https://doi.org/10.1101/2025.05.06.652352","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.06.02.657545","title":"PQBP1-dependent alternative RNA splicing underlies high calorie diet-induced cognitive impairment","date":"2025-06-06","source":"bioRxiv","url":"https://doi.org/10.1101/2025.06.02.657545","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":30974,"output_tokens":7449,"usd":0.102329,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":16941,"output_tokens":5532,"usd":0.111503,"stage2_stop_reason":"end_turn"},"total_usd":0.213832,"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\": 2003,\n      \"finding\": \"PIR121 (CYFIP2 ortholog in Dictyostelium) directly binds Rac and is required for proper SCAR/WAVE activity; genetic epistasis (pirA deletion in scar-null background) demonstrated that PIR121 acts primarily through SCAR in vivo. pirA-null cells show hyperactive SCAR phenotype consistent with PIR121 functioning as an inhibitor of SCAR in the absence of activating signals.\",\n      \"method\": \"Gene disruption, genetic epistasis (double mutant pirA-/scar-), actin polymerization assays, immunoblot for SCAR protein levels\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with double mutant rescue, multiple orthogonal phenotypic readouts, replicated in a model organism with clear functional consequence\",\n      \"pmids\": [\"12956949\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"CYFIP2 overexpression increases fibronectin-mediated adhesion in Jurkat T cells, and CYFIP2 knockdown reduces fibronectin-mediated adhesion in Jurkat and primary CD4+ T cells; this adhesion function depends on the Rac-1/WAVE1 pathway, as inhibition of Rac-1 phenocopies CYFIP2 reduction.\",\n      \"method\": \"Adenoviral overexpression, antisense oligodeoxynucleotide knockdown, fibronectin adhesion assays, Rac-1 inhibition\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function and loss-of-function experiments with functional readout, single lab, two orthogonal perturbation methods\",\n      \"pmids\": [\"15048733\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CYFIP2 is a direct transcriptional target of p53: the CYFIP2 promoter contains a p53-responsive element that confers p53 binding and transcriptional activation. Inducible CYFIP2 expression alone is sufficient to activate caspases and induce apoptosis. CYFIP2 protein subcellular localization is sensitive to leptomycin-B (CRM-1/exportin inhibitor), indicating nucleocytoplasmic shuttling.\",\n      \"method\": \"Promoter reporter assays, p53 binding assay, inducible overexpression with caspase activity and apoptosis readout, leptomycin-B treatment with localization analysis\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter binding + reporter assay + functional apoptosis readout, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"17245118\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CYFIP/PIR121-containing complexes coordinate Arf1 and Rac1 signaling at the TGN: Arf1 GTPase recruits clathrin-AP-1 coats and CYFIP-containing complexes to the TGN; Rac1 and its exchange factor β-PIX then activate these complexes to drive N-WASP- and Arp2/3-dependent actin polymerization, promoting tubule formation for clathrin-AP-1-coated carrier biogenesis.\",\n      \"method\": \"Co-immunoprecipitation, synthetic membrane reconstitution, siRNA knockdown, live imaging, biochemical fractionation\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution on synthetic membranes plus multiple orthogonal biochemical and imaging methods in a single rigorous study\",\n      \"pmids\": [\"20228810\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CYFIP2 (encoded by the nevermind locus) is required cell-autonomously for dorso-ventral topographic sorting of dorsonasal retinal ganglion cell axons in the zebrafish optic tract, and is also required cell-nonautonomously for proper retinal lamination.\",\n      \"method\": \"Forward genetic screen, positional cloning, cell-autonomous rescue via mosaic analysis, axon tracing\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function with mosaic rescue demonstrating cell autonomy, replicated phenotypic analysis across multiple axon tracts\",\n      \"pmids\": [\"20537992\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CYFIP2 knockdown rescues IMP-1-knockdown-induced caspase-3- and PARP-mediated apoptosis in SW480 colon cancer cells, placing CYFIP2 downstream of IMP-1 in a K-Ras-linked pro-apoptotic pathway. CYFIP2 mRNA is upregulated upon IMP-1 loss, consistent with its role as a p53-inducible proapoptotic gene.\",\n      \"method\": \"RNA interference knockdown, RNA microarray, RT-PCR validation, caspase-3/PARP apoptosis assays, epistasis rescue experiment\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis rescue experiment with defined apoptotic readout, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"21252116\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Reduced CYFIP2 expression in heterozygous null mice increases APP and BACE1 protein (but not mRNA) levels, elevates Aβ42 production, increases α-CaMKII protein expression leading to tau hyperphosphorylation at Ser-214, impairs dendritic spine maturity in CA1 pyramidal neurons, and prevents retention of spatial memory. This positions CYFIP2 as a translational regulator of APP and CaMKII at synapses.\",\n      \"method\": \"Cyfip2 heterozygous knockout mice, immunoblot, ELISA for Aβ42, immunohistochemistry, dendritic spine morphology analysis, Morris water maze\",\n      \"journal\": \"Brain : a journal of neurology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo knockout with multiple orthogonal molecular and behavioral readouts establishing mechanistic cascade in single rigorous study\",\n      \"pmids\": [\"27524794\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"De novo missense variants at CYFIP2 Arg87 (interface with WAVE1 in the WRC) disrupt hydrogen bonding between CYFIP2 and WAVE1, weaken CYFIP2–VCA domain interaction, and cause speckled ectopic accumulation of actin and CYFIP2 in transfected cells, consistent with gain-of-function WRC activation.\",\n      \"method\": \"Computational structural analysis, in vitro transfection, immunofluorescence of actin and CYFIP2 distribution, co-immunoprecipitation of mutant vs. WT CYFIP2 with VCA domain\",\n      \"journal\": \"Annals of neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — structural modeling plus in vitro functional validation, single lab, two orthogonal approaches\",\n      \"pmids\": [\"29534297\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CYFIP2 mediates contact-triggered fasciculation and repulsion responses between dorsal and ventral retinal ganglion cell axons and is specifically required for optic tract topographic sorting. CYFIP2 associates with transporting ribonucleoprotein particles and, upon axon-axon contact, translocates into growth cones to join the WAVE regulatory complex in the periphery, regulating actin remodeling and filopodial dynamics. The function in axon sorting is mediated by WRC binding, not translational regulation.\",\n      \"method\": \"In vivo knockdown/knockout in Xenopus RGCs, live imaging, fractionation, co-immunoprecipitation, FRAP, dominant-negative WRC binding mutant rescue\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods including live imaging, co-IP, and functional domain rescue in a single rigorous study\",\n      \"pmids\": [\"29518358\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Cyfip2 establishes the innate acoustic startle threshold by reducing neural activity in a defined set of excitatory hindbrain interneurons, acting independently of FMRP. Reactivation of cyfip2 after phenotype onset restores the baseline startle threshold.\",\n      \"method\": \"Forward genetic screen, whole-genome sequencing, conditional transgenic rescue, neural circuit calcium imaging, genetic epistasis with fmrp mutants\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — forward genetic identification, conditional temporal rescue, circuit-level functional imaging, epistasis, single rigorous study with multiple methods\",\n      \"pmids\": [\"29669291\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"De novo CYFIP2 missense variants cluster spatially in the tertiary structure at interfaces with WAVE1 and NCKAP1 of the WRC, with structural modeling predicting weakened WRC interactions. A splice-donor variant causes exon skipping and a truncated protein that likely escapes NMD.\",\n      \"method\": \"Trio whole-exome/genome sequencing, 3D structural modeling, RT-PCR validation of exon skipping\",\n      \"journal\": \"European journal of human genetics : EJHG\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Moderate — structural prediction without in vitro functional validation; RT-PCR for splicing is supportive but limited mechanistic depth\",\n      \"pmids\": [\"30664714\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Seven of eight intellectual-disability-causing CYFIP2 missense variants promote WRC activation in CRISPR/Cas9-engineered B16-F1 cells reconstituted with mutant CYFIP2. The majority of mutations occur in the WAVE-binding region required for WRC trans-inhibition; one mutation near the Rac-binding A-site eases Rac-mediated WRC activation. A truncating variant is a loss-of-function that fails to interact with WRC components.\",\n      \"method\": \"CRISPR/Cas9 cell line engineering, reconstitution with CYFIP2 variants, lamellipodia/WRC activation assays, co-immunoprecipitation\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution in engineered cells with multiple variants tested, mechanistic dissection of two distinct gain-of-function mechanisms plus identification of loss-of-function variant\",\n      \"pmids\": [\"32486060\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Structural modeling of CYFIP2 missense variants predicts disruption of interactions within the WRC or impaired CYFIP2 stability; patient-derived fibroblasts from six CYFIP2 variant carriers show aberrant WRC-mediated actin polymerization, substantiating WRC dysfunction as a cellular pathomechanism.\",\n      \"method\": \"Structural modeling, actin polymerization assays in patient fibroblasts\",\n      \"journal\": \"Genetics in medicine : official journal of the American College of Medical Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — patient fibroblast functional assay plus structural modeling, single study, two complementary but not fully orthogonal approaches\",\n      \"pmids\": [\"33149277\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CYFIP2 interactome in neonatal mouse forebrain (isolated via Cyfip2-3xFlag knock-in) contains 140 proteins including WRC actin regulators and 25 RNA-binding proteins including Argonaute proteins. Brain-disorder-associated CYFIP2 R87 variants (but not WT) inhibit stress granule formation and form intracellular clusters with Argonaute proteins under basal and stress conditions.\",\n      \"method\": \"Cyfip2-3xFlag knock-in mice, immunoprecipitation, mass spectrometry, overexpression of WT vs. mutant CYFIP2, immunofluorescence of stress granules and Argonaute\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo knock-in IP/MS interactome plus functional validation with two orthogonal readouts (stress granule formation, Argonaute co-clustering)\",\n      \"pmids\": [\"32560809\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Haploinsufficiency of Cyfip2 in mice increases filamentous actin, enlarges dendritic spines, and enhances excitatory synaptic transmission and intrinsic excitability specifically in layer 5 prefrontal cortex neurons. These layer-5-specific prefrontal defects are associated with increased seizure susceptibility and abnormal cortical auditory steady-state responses. Virus-mediated selective reduction of CYFIP2 in the PFC is sufficient to induce L5 hyperexcitability.\",\n      \"method\": \"Cyfip2+/- mice, electrophysiology (patch-clamp, EEG), electron microscopy of dendritic spines, F-actin staining, viral vector injection, RNA sequencing\",\n      \"journal\": \"Annals of neurology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo KO plus viral KD with multiple orthogonal electrophysiological, morphological, and molecular readouts in one study\",\n      \"pmids\": [\"32562430\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Cyfip2 heterozygous mice show enhanced presynaptic short-term plasticity upon high-frequency stimulation and a reduced number (but not volume or cristae density) of mitochondria in presynaptic boutons and axonal processes of mPFC layer 5. CYFIP2 is biochemically detected in a mitochondria-enriched fraction, and mitochondrial proteins were identified in the CYFIP2 interactome.\",\n      \"method\": \"Cyfip2+/- mice, patch-clamp electrophysiology, electron microscopy, biochemical fractionation, interactome cross-reference\",\n      \"journal\": \"Molecular brain\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo KO with electrophysiology plus EM plus fractionation, single lab, multiple orthogonal readouts\",\n      \"pmids\": [\"32917241\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NUAK2 directly binds CYFIP2 (demonstrated by co-immunoprecipitation), and NUAK2 silencing upregulates CYFIP2 expression; CYFIP2 knockdown reverses the anti-proliferative and anti-migratory effects of NUAK2 silencing in cervical cancer cells, placing CYFIP2 downstream of NUAK2.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, proliferation/migration/invasion assays, western blotting\",\n      \"journal\": \"Molecular medicine reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single Co-IP plus epistasis rescue, single lab, two orthogonal perturbation approaches\",\n      \"pmids\": [\"34558636\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The p.Arg87Cys variant enhances ubiquitination and proteasomal degradation of CYFIP2 protein, resulting in decreased CYFIP2 levels in Cyfip2+/R87C knock-in mouse brains. Cyfip2+/R87C mice recapitulate West syndrome phenotypes including spasm-like movements, microcephaly, impaired social communication, hippocampal cytoarchitectural disorganization, and gliosis.\",\n      \"method\": \"Cyfip2+/R87C knock-in mice, ubiquitination assay, proteasome inhibitor treatment, western blotting, behavioral and histological analyses\",\n      \"journal\": \"Annals of neurology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo knock-in model with direct ubiquitination assay and proteasome inhibitor rescue, establishing the molecular degradation mechanism\",\n      \"pmids\": [\"36251395\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CYFIP1 and CYFIP2 form largely non-overlapping interactomes in the mouse brain (only 8 common proteins out of 131 CYFIP1 and 140 CYFIP2 interactors). CYFIP1 and CYFIP2 do not significantly co-immunoprecipitate each other. CYFIP2 is detected only in neurons, while CYFIP1 is detected in both neurons and astrocytes, and CYFIP1 specifically associates with astrocytic focal adhesion proteins.\",\n      \"method\": \"Reciprocal co-IP using CYFIP1-2xMyc and CYFIP2-3xFlag knock-in mice, mass spectrometry, size-exclusion chromatography, immunohistochemistry, proximity ligation assay\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP with knock-in mice, mass spectrometry, multiple orthogonal localization methods; CYFIP2-specific findings are well-supported\",\n      \"pmids\": [\"35567753\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Loss of CYFIP2 in 3T3-L1 adipocytes induces browning of white adipocytes via activation of mTORC1 and suppression of GABA-BR signaling, independently promoting thermogenic gene expression (PGC-1α, PRDM16, UCP1) and mitochondrial biogenesis.\",\n      \"method\": \"siRNA knockdown in 3T3-L1 adipocytes, qRT-PCR, immunoblot, mTORC1 and GABA-BR pathway inhibitor experiments\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with pathway inhibitor dissection, single lab, two independent pathway analyses\",\n      \"pmids\": [\"35233844\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CYFIP2 deficiency in embryonic mouse forebrains alters levels of 278 proteins, including WRC components and numerous membraneless organelle (MLO)-associated proteins (nucleolus, stress granules, processing bodies). CYFIP2 knockdown suppresses eIF2α phosphorylation levels, thereby enhancing protein synthesis, through a WRC-dependent actin regulation mechanism.\",\n      \"method\": \"Cyfip2-knockout embryonic mice, quantitative proteomics, single-cell transcriptomics, MLO morphology imaging, eIF2α phosphorylation assay in CYFIP2 knockdown cells\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo KO proteomics plus mechanistic eIF2α assay in KD cells, single lab, multiple orthogonal approaches\",\n      \"pmids\": [\"38981622\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CYFIP2 RNA editing (A-to-I by ADAR enzymes) at codon 320 (K320E substitution) has distinct functional consequences: CYFIP2-KO neuroblastoma cells show actin disorganization and failure to differentiate; re-expression of the edited (E) isoform increases axon branch number, total axon length, and dendritic spine frequency more than the unedited (K) isoform in primary neurons with CYFIP2 knockdown.\",\n      \"method\": \"CRISPR-Cas9 CYFIP2 knockout, shRNA knockdown, overexpression of K vs. E isoforms, actin imaging, axon morphometry, dendritic spine quantification in primary neurons\",\n      \"journal\": \"Neurochemistry international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function plus isoform-specific rescue with multiple morphological readouts, single lab\",\n      \"pmids\": [\"41203017\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ELK3 directly suppresses CYFIP2 transcription in triple-negative breast cancer cells; loss of CYFIP2 downstream of ELK3 promotes filopodia-mediated migration/adhesion and reduces sensitivity to NK cell-mediated killing by modulating actin accumulation at NK cell contact sites.\",\n      \"method\": \"RNA-sequencing, ChIP or promoter analysis for ELK3-CYFIP2 direct regulation, siRNA/overexpression, confocal imaging of actin at NK cell contacts, flow cytometry of NK killing\",\n      \"journal\": \"Journal of experimental & clinical cancer research : CR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — molecular validation of ELK3 direct suppression of CYFIP2 with functional actin and NK cell readouts, single lab\",\n      \"pmids\": [\"39930469\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Cyfip2 controls the acoustic startle threshold through both Rac1 and FMRP pathways (but not FXR1 or FXR2). Cyfip2 acts acutely to maintain the startle threshold through branched actin polymerization and NMDARs. Loss of Cyfip2 alters cytoskeletal/ECM components, disrupts oxidative phosphorylation and GABA receptor signaling; pharmacological activation of GABAB receptors restores normal startle sensitivity in cyfip2 mutants.\",\n      \"method\": \"Conditional transgenic rescue, CRISPR/Cas9, drug screen, discovery proteomics, GABAB receptor agonist rescue\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional rescue plus proteomics plus pharmacological validation, single lab, preprint not peer-reviewed\",\n      \"pmids\": [\"38187577\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Cyfip2 acts through Rac1-dependent actin polymerization (not FMRP-mediated translation) during a critical developmental window (30–50 hpf) to establish visual sensorimotor circuits in zebrafish. cyfip2 mutants show reduced spontaneous and stimulus-evoked neuronal activity in the optic tectum consistent with impaired RGC functional input.\",\n      \"method\": \"Conditional transgenic temporal rescue, CRISPR/Cas9, phospho-ERK immunostaining, pan-neuronal calcium imaging, behavioral assays (prey capture, flash response, OKR)\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional temporal rescue with circuit-level imaging and pathway epistasis, single lab, preprint not peer-reviewed\",\n      \"pmids\": [\"41509276\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Extracellular vesicle (EV)-dependent secretion controls intracellular CYFIP2 protein homeostasis in cortical neurons: pharmacological and genetic blockade of EV release elevates intracellular CYFIP2, glutamate-evoked EV release reduces CYFIP2 levels, and Fmr1 KO neurons secrete fewer EVs with concomitantly elevated CYFIP2. Evoking EV release in FXS neurons normalizes intracellular CYFIP2.\",\n      \"method\": \"EV pharmacological/genetic blockade, glutamate stimulation, proteomic analysis of EV cargo, Fmr1 KO mouse neurons, immunoblot\",\n      \"journal\": \"Biomedicines\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple pharmacological and genetic perturbations with quantitative protein-level readouts, single lab\",\n      \"pmids\": [\"41153799\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"CYFIP2 is required for embryonic phrenic nerve axon development and diaphragm NMJ formation: Cyfip2-null embryos (E16.5) show reduced phrenic nerve axon length and branching, increased endplate bandwidth in sparse AChR regions, and reduced pre- and post-synaptic puncta density with decreased colocalization, demonstrating a peripheral nervous system role for CYFIP2.\",\n      \"method\": \"Cyfip2-null embryonic mice, immunofluorescence (synaptophysin, α-bungarotoxin), morphometric analysis of axon length/branching and NMJ organization\",\n      \"journal\": \"Molecular brain\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo knockout with multiple orthogonal morphological readouts, single study, single lab\",\n      \"pmids\": [\"42035098\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"CYFIP2 and p53 form a positive feedback loop that promotes renal fibrosis by inhibiting the Hippo pathway and enhancing YAP nuclear translocation in tubular epithelial cells. Tubule-specific CYFIP2 deletion attenuates hypertension-induced cellular senescence (reduced SA-β-gal, p53/p21, SASP; increased Klotho) and mitigates renal dysfunction. The p53 agonist Nutlin-3a reverses protection from CYFIP2 KO.\",\n      \"method\": \"Tubule-specific Cyfip2 knockout mice (DOCA/salt hypertension model), co-immunoprecipitation/interaction assay for CYFIP2-p53, YAP nuclear translocation imaging, SA-β-gal assay, Nutlin-3a rescue, siRNA in HK-2 cells\",\n      \"journal\": \"Acta pharmacologica Sinica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-type-specific in vivo KO plus pharmacological rescue establishing CYFIP2/p53-Hippo/YAP axis, single lab\",\n      \"pmids\": [\"42098400\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CYFIP2 is an evolutionarily conserved component of the WAVE regulatory complex (WRC) that inhibits WAVE/SCAR in the absence of activating signals by binding directly to Rac GTPase; upon Rac1 activation or axon-axon contact stimulation, CYFIP2 releases trans-inhibition of the WRC to drive Arp2/3-dependent actin polymerization, regulating lamellipodia, filopodia, dendritic spine morphology, and axon sorting. In neurons it also shuttles between ribonucleoprotein particles and the actin-nucleating WRC periphery, regulating local mRNA translation, stress granule dynamics, and eIF2α phosphorylation. CYFIP2 is a direct p53 transcriptional target that triggers caspase-dependent apoptosis when overexpressed, and its stability is controlled by ubiquitin-proteasome degradation (enhanced by the disease-linked R87C variant) and by extracellular vesicle-dependent secretion. Disease-associated hotspot variants (especially at Arg87) predominantly gain function by weakening the CYFIP2–WAVE1 interface and constitutively activating the WRC, while truncating variants represent loss-of-function alleles that fail to incorporate into the WRC.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CYFIP2 is an evolutionarily conserved component of the WAVE regulatory complex (WRC) that holds WAVE/SCAR-driven Arp2/3-dependent actin polymerization in a trans-inhibited state until relieved by Rac signaling, a function first established for its Dictyostelium ortholog PIR121, which binds Rac directly and acts as a SCAR inhibitor whose loss yields hyperactive SCAR [#0]. In neurons, CYFIP2 associates with transporting ribonucleoprotein particles and translocates into growth cones upon axon-axon contact to join the WRC at the periphery, where it controls actin remodeling and filopodial dynamics to drive contact-triggered fasciculation, repulsion, and topographic axon sorting in a WRC-binding-dependent manner [#8, #4]. This WRC-coupled actin control shapes dendritic spine morphology, synaptic transmission, and circuit excitability: Cyfip2 haploinsufficiency increases filamentous actin, enlarges spines, and produces layer-5 prefrontal hyperexcitability and seizure susceptibility [#14], and Cyfip2 sets the innate acoustic startle threshold through branched actin polymerization [#9]. Beyond actin, CYFIP2 functions as a translational regulator, controlling synaptic levels of APP and CaMKII protein independent of transcript [#6] and suppressing eIF2\\u03b1 phosphorylation to modulate protein synthesis through WRC-dependent actin regulation [#20], while interactome analysis places it with both WRC actin regulators and Argonaute-containing RNA-binding machinery and links it to stress granule dynamics [#13]. CYFIP2 is a direct p53 transcriptional target whose induction is sufficient to activate caspases and trigger apoptosis [#2], and its protein abundance is tuned by ubiquitin-proteasome degradation and by extracellular-vesicle-dependent secretion [#17, #25]. Disease-associated de novo missense variants cluster at the CYFIP2\\u2013WAVE1 interface\\u2014the Arg87 hotspot being prototypical\\u2014and predominantly act as gain-of-function alleles that weaken trans-inhibition and constitutively activate the WRC, whereas truncating variants are loss-of-function alleles that fail to incorporate into the complex [#7, #11]; the R87C variant additionally destabilizes CYFIP2 via enhanced ubiquitination and recapitulates West syndrome in knock-in mice [#17].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Established the founding biochemical logic of CYFIP2/PIR121 as a Rac-binding negative regulator of SCAR/WAVE, answering whether it activates or restrains actin nucleation.\",\n      \"evidence\": \"Gene disruption and pirA-/scar- double-mutant epistasis with actin assays in Dictyostelium\",\n      \"pmids\": [\"12956949\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve mammalian WRC architecture or the structural basis of trans-inhibition\", \"Mechanism of Rac-triggered relief not defined at this stage\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Connected CYFIP2 to integrin-based adhesion through the Rac1/WAVE1 pathway, extending its actin-regulatory role to a defined cellular behavior in T cells.\",\n      \"evidence\": \"Adenoviral overexpression and antisense knockdown with fibronectin adhesion assays plus Rac1 inhibition in Jurkat and primary CD4+ T cells\",\n      \"pmids\": [\"15048733\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct biochemical demonstration of CYFIP2 in the T-cell WRC not shown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Revealed a transcriptional/pro-apoptotic identity distinct from actin regulation by showing CYFIP2 is a direct p53 target sufficient to trigger caspase-dependent apoptosis.\",\n      \"evidence\": \"p53 promoter binding and reporter assays, inducible overexpression with caspase/apoptosis readouts, leptomycin-B localization analysis\",\n      \"pmids\": [\"17245118\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular effectors linking CYFIP2 to caspase activation not identified\", \"Relationship between nucleocytoplasmic shuttling and WRC function unresolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Demonstrated cell-autonomous and non-autonomous in vivo developmental roles, establishing CYFIP2 as required for retinal ganglion cell axon sorting and lamination, and showed CYFIP-complex coupling of Arf1/Rac1 signaling at the TGN.\",\n      \"evidence\": \"Zebrafish forward genetics with mosaic rescue and axon tracing; co-IP, synthetic membrane reconstitution and imaging at the TGN\",\n      \"pmids\": [\"20537992\", \"20228810\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular distinction between CYFIP2 actin and translational outputs not yet separated\", \"TGN study used CYFIP/PIR121 complexes broadly rather than CYFIP2 specifically\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined CYFIP2 as a synaptic translational regulator by showing haploinsufficiency raises APP, BACE1 and CaMKII protein without mRNA change, linking it to spine maturation and memory.\",\n      \"evidence\": \"Cyfip2 heterozygous mice with immunoblot, A\\u03b242 ELISA, spine morphology, and Morris water maze\",\n      \"pmids\": [\"27524794\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct mechanism of CYFIP2 control over specific transcript translation not defined\", \"Whether this acts via WRC or RNP machinery unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Resolved how CYFIP2 toggles between RNP and WRC functions in neurons and showed axon sorting depends on WRC binding rather than translational regulation, while genetic work defined an FMRP-independent circuit role.\",\n      \"evidence\": \"Xenopus RGC knockdown, live imaging, fractionation, co-IP, FRAP and dominant-negative WRC-binding rescue; zebrafish forward genetics with conditional rescue and circuit calcium imaging\",\n      \"pmids\": [\"29518358\", \"29669291\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signal that triggers RNP-to-WRC translocation not molecularly identified\", \"Cargo mRNAs of CYFIP2-RNP particles not enumerated\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Provided the first mechanistic basis for disease variants, showing Arg87 substitutions disrupt the CYFIP2\\u2013WAVE1/VCA interface to cause gain-of-function WRC activation.\",\n      \"evidence\": \"Structural modeling, transfection with actin/CYFIP2 immunofluorescence, and co-IP of mutant versus WT with VCA domain\",\n      \"pmids\": [\"29534297\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Quantitative WRC activation in physiological context not measured\", \"Generalizability beyond Arg87 not tested here\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Mapped the spatial clustering of de novo variants at WRC interfaces (WAVE1, NCKAP1) and identified a splice variant predicting a truncated protein.\",\n      \"evidence\": \"Trio exome/genome sequencing, 3D structural modeling, RT-PCR of exon skipping\",\n      \"pmids\": [\"30664714\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Structural prediction without in vitro functional validation\", \"NMD escape and truncated protein behavior inferred not demonstrated\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Systematically distinguished gain-of-function from loss-of-function disease mechanisms, showing most variants activate the WRC by impairing trans-inhibition while truncating variants fail to incorporate, and confirmed WRC dysfunction in patient cells.\",\n      \"evidence\": \"CRISPR/Cas9 reconstitution in B16-F1 cells with WRC activation assays and co-IP; patient fibroblast actin polymerization assays with structural modeling\",\n      \"pmids\": [\"32486060\", \"33149277\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo consequences of constitutive WRC activation in neurons not addressed in cell models\", \"One variant near the Rac A-site implies a second activation mechanism not fully dissected\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined CYFIP2's brain interactome and circuit-level synaptic functions, linking it to WRC and Argonaute/RNA-binding proteins, prefrontal layer-5 hyperexcitability, presynaptic plasticity, and mitochondrial associations.\",\n      \"evidence\": \"Cyfip2-3xFlag knock-in IP/MS interactome with stress granule and Argonaute imaging; Cyfip2+/- electrophysiology, EM, F-actin staining, viral knockdown, RNA-seq, and mitochondrial fractionation\",\n      \"pmids\": [\"32560809\", \"32562430\", \"32917241\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct role of CYFIP2 at mitochondria versus indirect association unresolved\", \"Causal link between Argonaute co-clustering and translational output not established\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Established CYFIP2 protein homeostasis as a disease mechanism and clarified the divergence from its paralog, showing R87C destabilizes CYFIP2 via ubiquitin-proteasome degradation to model West syndrome, while CYFIP1 and CYFIP2 form largely non-overlapping interactomes and do not associate.\",\n      \"evidence\": \"Cyfip2+/R87C knock-in mice with ubiquitination and proteasome-inhibitor assays and behavior; reciprocal co-IP knock-in mice with mass spectrometry, SEC, IHC and PLA\",\n      \"pmids\": [\"36251395\", \"35567753\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"E3 ligase mediating CYFIP2 ubiquitination not identified\", \"How reduced abundance reconciles with gain-of-function WRC activation for R87C not fully integrated\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Linked CYFIP2 to translational control of the integrated stress response, showing it suppresses eIF2\\u03b1 phosphorylation through WRC-dependent actin regulation and influences membraneless organelle proteomes.\",\n      \"evidence\": \"Cyfip2-knockout embryonic mouse proteomics, single-cell transcriptomics, MLO imaging, and eIF2\\u03b1 phosphorylation assay in knockdown cells\",\n      \"pmids\": [\"38981622\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic bridge from actin regulation to eIF2\\u03b1 kinase/phosphatase activity not defined\", \"Specific transcripts whose synthesis is affected not identified\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extended CYFIP2 regulation to extracellular-vesicle secretion and RNA editing, and broadened its roles into cancer cell migration/immune evasion and adipocyte browning.\",\n      \"evidence\": \"EV blockade and glutamate stimulation with Fmr1 KO neurons and EV proteomics; ADAR-edited K320E isoform rescue in neurons; ELK3 promoter suppression with NK-killing assays; siRNA in 3T3-L1 adipocytes with mTORC1/GABA-BR dissection\",\n      \"pmids\": [\"41153799\", \"41203017\", \"39930469\", \"35233844\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of editing isoform balance in vivo unclear\", \"How EV secretion integrates with proteasomal control of CYFIP2 abundance unresolved\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Expanded CYFIP2 functions into peripheral nervous system development and non-neuronal disease, demonstrating roles in phrenic nerve/NMJ formation and a CYFIP2\\u2013p53 feedback loop driving renal fibrosis via Hippo/YAP.\",\n      \"evidence\": \"Cyfip2-null embryonic mouse NMJ morphometry; tubule-specific Cyfip2 KO hypertension model with CYFIP2-p53 co-IP, YAP imaging, senescence assays, and Nutlin-3a rescue\",\n      \"pmids\": [\"42035098\", \"42098400\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether peripheral NMJ phenotype is WRC-dependent not tested\", \"Direct mode of CYFIP2-p53 physical interaction and its relation to actin function unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how CYFIP2 mechanistically partitions its three documented activities\\u2014WRC trans-inhibition, RNP-associated translational control, and p53-linked apoptotic/transcriptional signaling\\u2014and what molecular signals route the same protein between these distinct pools.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model integrating WRC binding with RNP/translational roles\", \"Signals governing RNP-to-WRC switching unidentified\", \"E3 ligase and full regulatory logic of CYFIP2 abundance unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 8, 11]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0, 8, 14]},\n      {\"term_id\": \"GO:0045182\", \"supporting_discovery_ids\": [6, 20]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [13, 8]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [8, 11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [8, 13]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [8, 14, 21]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [15]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [4, 8, 26]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [6, 9, 14]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [6, 20]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [2, 5]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [7, 11, 17]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 3]}\n    ],\n    \"complexes\": [\"WAVE regulatory complex (WRC)\"],\n    \"partners\": [\"WASF1\", \"NCKAP1\", \"RAC1\", \"ARF1\", \"AGO\", \"TP53\", \"NUAK2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}