{"gene":"FER","run_date":"2026-06-09T23:54:43","timeline":{"discoveries":[{"year":1995,"finding":"FER kinase constitutively associates with pp120 (p120 catenin) through a ~400 amino acid coiled-coil sequence in its amino terminus; growth factor (EGF, PDGF) stimulation induces phosphorylation of FER and associated pp120 and growth factor receptors.","method":"Co-immunoprecipitation, in vitro oligomerization assay, growth factor stimulation of A431 cells and 3T3 fibroblasts","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP, domain mapping, and functional stimulation assays in a single focused study","pmids":["7623846"],"is_preprint":false},{"year":1998,"finding":"FER kinase directly binds cortactin through its SH2 domain, and FER kinase activity is required for growth factor-dependent phosphorylation of cortactin; a dominant-negative FER mutant blocks this phosphorylation.","method":"Co-immunoprecipitation, subcellular fractionation, dominant-negative mutant expression, in vitro kinase assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct binding mapped to SH2 domain, dominant-negative functional validation, multiple orthogonal methods in one study","pmids":["9722593"],"is_preprint":false},{"year":1991,"finding":"FER protein is present in both the cytoplasm and nucleus, where it associates with the chromatin fraction.","method":"Subcellular fractionation, immunofluorescence","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — two orthogonal localization methods but single study with no direct functional consequence linked","pmids":["1990274"],"is_preprint":false},{"year":1998,"finding":"Overexpression of FER in embryonic fibroblasts induces cell rounding and detachment from substratum, coincident with increased FER–p120(cas) complex formation, tyrosine phosphorylation of p120(cas) and β-catenin, and dissolution of E-cadherin/α-catenin/β-catenin adherens junction complexes.","method":"Tetracycline-regulatable overexpression system, co-immunoprecipitation, phosphotyrosine Western blotting","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — inducible overexpression with quantitative loss of adherens junction co-IP and specific phosphorylation readouts","pmids":["9742093"],"is_preprint":false},{"year":1999,"finding":"FER forms trimers in vivo via cooperative interaction of its first and second coiled-coil domains; disruption of either domain abolishes oligomerization. Oligomerization potentiates autophosphorylation in trans at three major sites, but is not required for kinase activation. The testis-specific FerT isoform does not oligomerize.","method":"Gel filtration, co-immunoprecipitation, in vitro kinase assay with deletion mutants","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — multiple domain mutants, biochemical reconstitution of oligomerization, autophosphorylation mapping, comparison with FerT","pmids":["10391941"],"is_preprint":false},{"year":1999,"finding":"Mutation of the conserved aspartate (D743R) in subdomain IX of FER's kinase domain abolishes catalytic activity; structural modeling indicates this is due to van der Waals repulsion disrupting the catalytic loop.","method":"Active-site mutagenesis, in vitro kinase assay in mammalian cells and bacteria, structural modeling","journal":"Protein engineering","confidence":"High","confidence_rationale":"Tier 1 / Moderate — catalytic-dead mutagenesis validated in two expression systems with structural rationale","pmids":["10195287"],"is_preprint":false},{"year":2000,"finding":"FER is a downstream target of Fyn kinase in the osmotic stress response: cell shrinkage activates FER in a Fyn-dependent (but Src-independent) manner, and activated FER phosphorylates cortactin at tyrosines 421, 466, and 482. FER also mediates Fyn-dependent phosphorylation of β-catenin, α-catenin, and p120(Cas) upon shrinkage, causing dissociation of β-catenin from cell-cell contacts.","method":"Kinase activity assays, Fyn/Src-deficient MEFs, site-directed mutagenesis of cortactin tyrosines, co-immunoprecipitation, Src family inhibitor PP2","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic (kinase-null cells) and pharmacological evidence, site-specific mutagenesis, multiple substrates confirmed, replicated in multiple cell types","pmids":["10921917"],"is_preprint":false},{"year":2000,"finding":"FER mediates cross-talk between N-cadherin and β1-integrins: displacement of FER from the N-cadherin juxtamembrane complex (by a competing peptide) causes FER to relocate to the β1-integrin complex, inhibiting both N-cadherin and β1-integrin function. A peptide matching FER's first coiled-coil domain prevents FER accumulation in the integrin complex.","method":"Trojan peptide competition in cells and tissues, co-immunoprecipitation, cadherin- and integrin-mediated adhesion assays, neurite outgrowth assay","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — peptide competition with domain specificity and functional adhesion readouts, single lab","pmids":["10851023"],"is_preprint":false},{"year":2000,"finding":"p94(fer) (but not p51(ferT)) activates STAT3 by direct tyrosine phosphorylation; endogenous STAT3 and p94(fer) co-immunoprecipitate. The ability to activate STAT3 is determined by the N-terminal sequence of p94(fer), not by its SH2/kinase domains shared with FerT.","method":"Co-immunoprecipitation, double immunofluorescence, in vivo phosphorylation assay, chimeric kinase swapping of N-terminal sequences","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — co-IP of endogenous proteins confirmed, domain-swap experiments defining N-terminal specificity, multiple orthogonal methods","pmids":["10878010"],"is_preprint":false},{"year":2000,"finding":"N-terminal coiled-coil domains of p94(fer) direct oligomerization and autophosphorylation in trans in vivo; the unique N-terminal 43-aa of p51(ferT) prevents its autophosphorylation. The N-terminal tail of p94(fer) expressed ectopically acts as a dominant negative and increases the G0/G1 fraction.","method":"In vivo autophosphorylation assays, N-terminal deletion and chimeric mutants, cell cycle analysis","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple mutant constructs, cell cycle readout, single lab","pmids":["10998246"],"is_preprint":false},{"year":2001,"finding":"Mice homozygous for kinase-inactivating Fer(D743R) mutation are viable and fertile; cortactin phosphorylation is specifically reduced in PDGF-stimulated fer(D743R) MEFs, while phosphorylation of STAT3, p120(ctn), and β-catenin is unaffected, establishing cortactin as a specific Fer substrate in vivo.","method":"Knock-in mouse model, Western blotting of phospho-substrates in MEFs, PDGF/EGF stimulation","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knock-in model, substrate-specific phosphorylation analysis, multiple stimuli and substrates tested","pmids":["11134346"],"is_preprint":false},{"year":2001,"finding":"Fer kinase is diffusely cytoplasmic (not nuclear) throughout the cell cycle when tracked by GFP fusion and confocal microscopy, in contrast to earlier fractionation reports.","method":"GFP fusion, confocal fluorescence microscopy, cell cycle synchronization","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — live-cell imaging, single lab, contradicts earlier fractionation data","pmids":["11339827"],"is_preprint":false},{"year":2002,"finding":"Fer kinase is activated downstream of FcεRI aggregation in mast cells and is required for sustained (not initial) p38 MAPK activation; Fer-deficient mast cells show increased adhesion and decreased migration upon FcεRI/Kit activation.","method":"Bone marrow-derived mast cells from fer(DR/DR) knock-in mice, kinase activity assay, p38/ERK phosphorylation Western blotting, degranulation and migration assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic knock-in model, multiple functional and biochemical readouts, pathway placement via p38","pmids":["12192036"],"is_preprint":false},{"year":2002,"finding":"Plectin directly binds the N-terminal domain (aa 1–329) of Fer kinase; this interaction negatively regulates Fer catalytic activity, as Fer is hyperphosphorylated and hyperactive in plectin-null fibroblasts.","method":"Recombinant protein pulldown, co-immunoprecipitation from fibroblast lysates, immunocomplex kinase assay in plectin-null vs wild-type cells","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding confirmed with recombinant proteins and endogenous co-IP, kinase activity measured in genetic null background","pmids":["12200133"],"is_preprint":false},{"year":2003,"finding":"Fer phosphorylates β-catenin at Tyr-142 in vitro, disrupting the β-catenin–α-catenin interaction; in K-ras–expressing cells, Fer is activated and Tyr-142 phosphorylation is increased. Fer is constitutively bound to p120 catenin, which acts as a docking protein facilitating Fer activation by Yes kinase.","method":"In vitro kinase assay, stable K-ras transfectants, co-immunoprecipitation, phosphospecific antibodies","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro phosphorylation at defined residue, genetic cell model, multiple orthogonal methods","pmids":["12640114"],"is_preprint":false},{"year":2003,"finding":"Fer kinase phosphorylates PECAM-1 at its ITIM motif and at Tyr-700; Fer is localized on growing microtubules in vascular endothelial cells where it co-localizes with p120 catenin at nascent cell-cell contacts, and a kinase-dead Fer mutant blocks PECAM-1 phosphorylation upon homophilic engagement.","method":"Expression cloning screen, in vitro kinase assay, dominant-negative mutant, GFP-Fer live-cell time-lapse microscopy","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — expression cloning identification, in vitro kinase validation, dominant-negative functional test, live-cell localization imaging","pmids":["12972546"],"is_preprint":false},{"year":2003,"finding":"Fer kinase associates with N-cadherin, γ-catenin, p120ctn, c-Src, Rab8, actin, and vimentin (but not E-cadherin, afadin, nectin-3, or integrin β1) in the testis, linking it specifically to N-cadherin/catenin-based adherens junctions and intermediate filament structures.","method":"Co-immunoprecipitation from testis/Sertoli cell lysates, immunohistochemistry with stage-specific localization","journal":"Biology of reproduction","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — co-IP panel distinguishing binding partners, replicated across cell and tissue models, single lab","pmids":["12700184"],"is_preprint":false},{"year":2004,"finding":"Fer phosphorylates PTP1B at Tyr-152, enabling PTP1B to bind the cytoplasmic domain of cadherin and maintain β-catenin in a dephosphorylated state at Tyr-654; Fer interacts with cadherin indirectly through p120ctn. fer(D743R) fibroblasts lose cadherin-associated PTP1B and β-catenin at cell-cell contacts.","method":"Domain mapping (co-IP of Fer/p120ctn interaction domains), peptide competition in live cells, phospho-site mutant β-catenin rescue, analysis of fer(D743R) knock-in MEFs","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — domain mapping, peptide competition, phospho-mutant rescue, and genetic knock-in validation in one study","pmids":["15226396"],"is_preprint":false},{"year":2004,"finding":"Actin depolymerization (by latrunculin B) promotes Fer–cortactin association and Fer-mediated phosphorylation of cortactin C-terminal tyrosines; the N-terminal actin-binding domain of cortactin is required for efficient association with Fer and for phosphorylation of C-terminal tyrosines. This process is Fyn/Fer-dependent and Src/Abl-independent.","method":"Latrunculin B/jasplakinolide treatment, candidate kinase-deficient cell lines, co-immunoprecipitation, phospho-mapping of cortactin deletion mutants","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic kinase-null cells, multiple inhibitor/activator conditions, domain mapping of binding and phosphorylation","pmids":["15030313"],"is_preprint":false},{"year":2005,"finding":"FER phosphorylates N-cadherin-associated cortactin, which promotes N-cadherin immobilization at nascent contacts and strengthens intercellular adhesion; in fer(D743R) fibroblasts, cortactin phosphorylation after N-cadherin ligation is reduced, GFP-N-cadherin mobility is faster (FRAP), and intercellular adhesion strength is halved.","method":"N-cadherin-coated bead pulldown, FRAP, shear wash-off adhesion assay, fer(D743R) MEFs","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple quantitative functional assays (FRAP, force measurement, pulldown) using genetic knock-in cells","pmids":["16176974"],"is_preprint":false},{"year":2006,"finding":"Fer and Fps/Fes kinases are activated downstream of FcεRI in a Lyn-dependent manner and phosphorylate PECAM-1 ITIMs and Tyr-700; mast cells lacking Fer/Fps show reduced FcεRI-induced PECAM-1 phosphorylation and exaggerated degranulation at low antigen doses.","method":"Kinase activity assay, in vitro phosphorylation of PECAM-1 C-terminus, ITIM phosphorylation in transfected cells, mast cells from Lyn-null and fer/fps kinase-null mice","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic null models, in vitro substrate validation, pathway placement (Lyn→Fer→PECAM-1)","pmids":["16731527"],"is_preprint":false},{"year":2007,"finding":"Fer mediates cortactin tyrosine phosphorylation downstream of integrin engagement in a ROS-dependent manner; fer(DR/DR) MEFs show reduced fibronectin-induced cortactin phosphorylation and impaired cell migration; ROS scavengers or NADPH oxidase inhibition attenuate Fer and cortactin phosphorylation.","method":"H2O2 stimulation, fibronectin engagement, fer(DR/DR) and Src/Yes/Fyn-null MEFs, NADPH oxidase inhibitor, wound-healing migration assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple genetic cell models, pharmacological validation of ROS link, migration functional readout","pmids":["17606629"],"is_preprint":false},{"year":2007,"finding":"Fer kinase is required for Sema3A-induced axon retraction in dorsal root ganglion neurons; Fer phosphorylates tubulin and CRMP2 in vitro; CRMP2 and PlexinA1 inhibit Fer autophosphorylation activity in vitro. DRG neurons from fer-deficient mice show significantly diminished axon retraction to Sema3A.","method":"fer(DR/DR) knock-in and fps-null DRG neuron cultures, Sema3A retraction assay, in vitro kinase assay (tubulin, CRMP2 substrates), autophosphorylation inhibition assay","journal":"BMC developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic knock-in and knock-out neuron models, in vitro substrate identification, functional axon retraction assay","pmids":["18053124"],"is_preprint":false},{"year":2008,"finding":"Presynaptic Fer depletion prevents localization of active zone constituents and synaptic vesicles and inhibits excitatory synapse formation. Fer operates in a p120ctn→Fer→SHP-2→β-catenin presynaptic pathway; depletion of p120ctn or SHP-2 similarly disrupts synaptic vesicle localization, and active SHP-2 or β-catenin overexpression rescues synapse formation in the absence of Fer.","method":"Fer shRNA in hippocampal neurons, epistasis rescue experiments with SHP-2 and β-catenin, immunofluorescence for active zone/synaptic vesicle markers, electrophysiology","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic pathway placement by epistasis/rescue, multiple neuronal readouts including electrophysiology","pmids":["19047464"],"is_preprint":false},{"year":2009,"finding":"Phosphatidic acid (PA) binds to an FX (F-BAR extension) domain in Fer, adjacent to its F-BAR domain, and enhances Fer-mediated phosphorylation of cortactin; Fer overexpression enhances lamellipodia formation and cell migration in a PLD-activity- and PA–FX interaction-dependent manner.","method":"Lipid-binding assay, identification of FX domain, cortactin phosphorylation assay, lamellipodia imaging, cell migration assay with PLD inhibitor","journal":"Science signaling","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — novel domain identified with lipid-binding validation, domain mutant, functional migration readout in one study","pmids":["19738202"],"is_preprint":false},{"year":2009,"finding":"FER activates STAT3 via the IL-6/gp130 pathway: IL-6 triggers rapid formation of Fer/gp130 and Fer/STAT3 complexes, and FER's SH2 domain mediates interaction with STAT3. Modulating FER expression bidirectionally controls STAT3 phosphorylation, nuclear translocation, and IL-6-mediated prostate cancer cell growth.","method":"Co-immunoprecipitation (Fer/STAT3, Fer/gp130), siRNA knockdown and overexpression, nuclear fractionation, cell proliferation assay","journal":"Molecular cancer research : MCR","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP with endogenous proteins, domain identification (SH2), bidirectional functional manipulation, single lab","pmids":["19147545"],"is_preprint":false},{"year":2010,"finding":"Neuropilin-1 (NRP1) directly and selectively interacts with FER kinase to transduce Sema3A-induced cortical neuron death and axonal retraction; Fer RNAi attenuates Sema3A-induced neurite retraction and neuronal death, and reduces cerebral ischemia-induced brain damage in vivo.","method":"Co-immunoprecipitation (NRP1–Fer), Fer siRNA, cortical neuron culture Sema3A assay, mouse focal cerebral ischemia model","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct interaction co-IP, loss-of-function in neurons and in vivo, single lab","pmids":["20133938"],"is_preprint":false},{"year":2011,"finding":"FER overexpression activates NF-κB through EGF receptor signaling: FER binds EGFR (co-IP), FER overexpression increases EGFR and ERK phosphorylation, and FER-mediated NF-κB activation confers resistance to quinacrine; ERK inhibition or FER knockdown blocks EGF-induced NF-κB activation.","method":"Insertional mutagenesis screen, cDNA overexpression, co-immunoprecipitation of FER–EGFR, siRNA knockdown, ERK/EGFR phosphorylation Western blotting","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct FER–EGFR co-IP, bidirectional manipulation, functional drug-resistance readout, single lab","pmids":["21518868"],"is_preprint":false},{"year":2013,"finding":"FER phosphorylates Vav2 at Tyr-172 downstream of EGFR signaling in lung adenocarcinoma cells, which increases Vav2 GEF activity; FER knockdown reduces Rac-GTP localization to lamellipodia, impairs cell migration and invasion in vitro, and reduces spontaneous metastasis in vivo without affecting tumor growth.","method":"Stable shRNA knockdown, in vitro Fer–Vav2 phosphorylation assay, Rac-GTP pull-down, invasion assay, subcutaneous tumor/spontaneous metastasis mouse model","journal":"Molecular cancer research : MCR","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct substrate phosphorylation at defined site, genetic KD with multiple in vitro and in vivo functional readouts","pmids":["23699534"],"is_preprint":false},{"year":2013,"finding":"FER associates with the PDGF β-receptor through multiple autophosphorylation sites (Tyr-579, Tyr-581, Tyr-740, Tyr-1021); FER kinase-independently (as an adaptor) promotes PDGF-BB-induced STAT3 phosphorylation (not STAT5, ERK1/2, or Akt), and is required for anchorage-independent growth and in vivo tumor formation.","method":"Co-immunoprecipitation (Fer–PDGFRβ), siRNA knockdown, kinase-dead Fer expression, STAT3/STAT5/ERK/Akt phosphorylation Western blotting, soft agar colony assay, xenograft","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — receptor-kinase binding sites mapped, kinase-dead adaptor function demonstrated, specific substrate selectivity established, in vivo validation","pmids":["23589302"],"is_preprint":false},{"year":2014,"finding":"Src and Fer directly associate with LRP6 and phosphorylate it on conserved tyrosine residues adjacent to PPPSPxS motifs, negatively regulating Wnt/β-catenin signaling; MEFs lacking Src and Fer show enhanced Wnt signaling. CK1γ inhibits Fer-induced LRP6 phosphorylation, suggesting a de-repression mechanism.","method":"cDNA expression screen, co-immunoprecipitation (Fer–LRP6), direct in vitro phosphorylation assay, fer/src-null MEFs (Wnt reporter), epistasis analysis","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — direct phosphorylation demonstrated in vitro, genetic null MEFs for epistasis, pathway placement relative to β-catenin","pmids":["25391905"],"is_preprint":false},{"year":2016,"finding":"FER phosphorylates MET (HGFR) at Tyr-1349 in a HGF-ligand- and MET-autophosphorylation-independent manner; this activates RAC1/PAK1 and promotes a kinase-independent MET scaffolding function leading to GAB1 recruitment and phosphorylation, and specific SHP2-ERK pathway activation, driving ovarian cancer metastasis in vitro and in vivo.","method":"Co-immunoprecipitation (FER–MET), site-specific phosphorylation assay at MET Tyr-1349, RNAi knockdown of FER, RAC1-GTP pull-down, in vivo ovarian cancer metastasis model","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — novel substrate (MET) and phosphorylation site defined, scaffolding vs kinase functions distinguished, downstream pathway mapped, in vivo validation","pmids":["27401557"],"is_preprint":false},{"year":2016,"finding":"FER kinase is responsible for the capacitation-associated increase in sperm tyrosine phosphorylation: Fer kinase-inactivating knock-in mice (but not Pyk2-null mice) fail to show capacitation-associated tyrosine phosphorylation increases, and their sperm display reduced in vitro fertilization ability.","method":"Fer kinase-inactivating knock-in mice, Pyk2-null mice, pharmacological inhibitors, Western blotting of tyrosine phosphorylation during capacitation, in vitro fertilization assay","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knock-in model definitively attributed function, compared with Pyk2 null to rule out related kinase, functional fertilization assay","pmids":["27226326"],"is_preprint":false},{"year":2017,"finding":"The MAN2A1-FER fusion protein localizes to the Golgi (via MAN2A1 signal peptide), has ~4-fold higher tyrosine kinase activity than wild-type FER, and phosphorylates EGFR at Tyr-88; expression activates BRAF, MEK, and AKT signaling and promotes proliferation, invasion, and tumor growth in vivo.","method":"RT-PCR in tumor samples, tagged fusion protein expression, Golgi fractionation, in vitro kinase assay, EGFR pY88 detection, xenograft tumor model, knockout in HUH7 cells","journal":"Gastroenterology","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro kinase assay with site-specific substrate, subcellular localization, genetic KO, and in vivo tumor model","pmids":["28245430"],"is_preprint":false},{"year":2017,"finding":"Fer and FerT associate with the mitochondrial electron transport chain in cancer cells; a Fer/FerT inhibitor (E260) disrupts mitochondrial function, induces energy-consuming autophagy, and causes FER to dissociate from PARP-1, leading to PARP-1 activation, energy crisis, and necrotic death selectively in malignant cells.","method":"Subcellular fractionation/mitochondrial localization, small-molecule inhibitor E260, co-immunoprecipitation (Fer–PARP-1), ATP assay, mitochondrial morphology imaging, xenograft tumor model","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mitochondrial localization by fractionation, co-IP of Fer–PARP-1, functional metabolic readouts, in vivo validation, single lab","pmids":["29038547"],"is_preprint":false},{"year":2018,"finding":"FER tyrosine kinase phosphorylates CRMP2 at Tyr-479 and Tyr-499; crystal structures of wild-type and phosphomimetic CRMP2-Y479E show that phosphorylation prevents CRMP2 tetramerization, reducing microtubule bundling activity. FER depletion or sub-therapeutic inhibitor doses increase paclitaxel-induced microtubule stability and cytotoxicity in ovarian cancer cells and in vivo.","method":"In vitro phosphorylation assay, X-ray crystallography of CRMP2 and CRMP2-Y479E, microtubule bundling assay, siRNA knockdown, xenograft model","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structures of WT and phosphomimetic CRMP2, direct phosphorylation assay, microtubule functional assay, and in vivo validation","pmids":["29396402"],"is_preprint":false},{"year":2019,"finding":"YY1 directly binds the FER promoter region to suppress FER transcription; reduced FER downstream leads to decreased formation of the STAT3–MMP2 complex, lower MMP2 expression, and inhibition of pancreatic cancer migration and invasion.","method":"Luciferase reporter, EMSA, ChIP assay, FER knockdown epistasis, in vivo invasion assay","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct promoter binding confirmed by three complementary methods, epistasis with FER knockdown establishing pathway order","pmids":["31404611"],"is_preprint":false},{"year":2021,"finding":"FER phosphorylates PKCδ at Tyr-374; phospho-Y374-PKCδ prevents RAB5 release from late endosomes, blocking RAB5→RAB7 switching, thereby inhibiting EGFR lysosomal degradation and promoting EGFR recycling to the cell surface. PTPN14 phosphatase reverses this by dephosphorylating pY374-PKCδ.","method":"In vitro FER kinase assay (PKCδ Y374), phospho-specific antibodies, endosome fractionation, RAB5/RAB7 immunofluorescence, PTPN14 dephosphorylation assay, TNBC patient tissue analysis","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — direct substrate phosphorylation at defined site, mechanistic RAB switch demonstrated, counteracting phosphatase identified, clinical tissue correlation","pmids":["33411917"],"is_preprint":false},{"year":2022,"finding":"FER engages its kinase domain to associate with the PH and PTB domains of IRS4 and phosphorylates IRS4 at Tyr-779; this phosphorylation recruits PIK3R2/p85β and activates the PI3K-AKT pathway, promoting ovarian cancer cell proliferation in vitro and in vivo.","method":"Mass spectrometry substrate identification, co-immunoprecipitation (kinase domain–IRS4 PH/PTB), in vitro phosphorylation assay, proximity-based tagging (BioID), phosphorylation-defective mutant rescue, xenograft tumor model","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — substrate identified by MS, direct binding domain mapped, phospho-site specific mutagenesis rescue, in vivo validation","pmids":["35550247"],"is_preprint":false},{"year":1998,"finding":"FER (p94fer) and FerT (p51ferT) phosphorylate the TATA element modulatory factor (TMF) on its carboxy-terminal region in vitro and in vivo; TMF was identified as a FER substrate by yeast two-hybrid screening.","method":"Yeast two-hybrid screen, in vitro kinase assay, in vivo kinase assay, deletion mapping of TMF carboxy-terminus","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid plus in vitro and in vivo kinase assays, domain mapping, single lab","pmids":["9742951"],"is_preprint":false},{"year":2006,"finding":"Downregulation of Fer by RNAi arrests prostate and breast carcinoma cells at G0/G1. At the molecular level, Fer associates with the pRB phosphatase PP1α (via two PP1-binding motifs in its kinase domain), and Fer levels bidirectionally modulate PP1α activity, controlling pRB phosphorylation state and cell-cycle progression.","method":"RNAi knockdown, co-immunoprecipitation (Fer–PP1α), PP1α enzymatic activity assay, pRB phosphorylation Western blotting, flow cytometry cell-cycle analysis","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP, enzyme activity assay, bidirectional manipulation, multiple cancer cell lines, single lab","pmids":["16732323"],"is_preprint":false},{"year":2013,"finding":"Fer kinase regulates AR tyrosine phosphorylation at Tyr-223 via its SH2 domain interaction with AR, downstream of IL-6/STAT3 signaling, to drive androgen receptor (AR) transcriptional activation and PSA expression in prostate cancer cells.","method":"Co-immunoprecipitation (Fer–AR via SH2 domain), phospho-AR Tyr-223 detection, Fer siRNA/overexpression, PSA reporter assay, immunofluorescence co-localization in CRPC tissue","journal":"Molecular and cellular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct Fer–AR interaction mapped to SH2 domain, phospho-site identification, functional transcriptional readout, single lab","pmids":["23906537"],"is_preprint":false},{"year":2015,"finding":"c-Src directly activates Fer by initiating its autophosphorylation, which is further amplified by Fer oligomerization; activated Fer phosphorylates ezrin at focal adhesion membranes, inducing cell transformation. The Src→Fer→ezrin axis is required for tumorigenesis and invasiveness in c-Src-upregulated cancer cells.","method":"Co-immunoprecipitation (c-Src–Fer at focal adhesion membranes), in vitro kinase assay (Fer phosphorylation of ezrin), Fer knockdown/overexpression, transformation assay, invasion assay","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct kinase cascade demonstrated, novel substrate (ezrin) identified, functional transformation readout, single lab","pmids":["25867068"],"is_preprint":false},{"year":2000,"finding":"Fer associates with insulin signaling complexes in adipocytes: insulin stimulates association of Fer with IRS-1–PI3-kinase complexes and activates PI3-kinase activity in anti-Fer immunoprecipitates, without stimulating Fer tyrosine phosphorylation; PDGF stimulates Fer recruitment to PDGFR–p85 PI3K complexes with Fer phosphorylation.","method":"Co-immunoprecipitation from 3T3-L1 adipocytes, PI3K enzymatic activity assay in Fer immunoprecipitates, insulin and PDGF stimulation","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — PI3K activity measured in Fer precipitates, distinct phosphorylation responses to two ligands, single lab","pmids":["11006284"],"is_preprint":false}],"current_model":"FER is a cytoplasmic non-receptor tyrosine kinase that oligomerizes via N-terminal coiled-coil domains, is activated downstream of growth factor receptors (EGFR, PDGFR), cytokine receptors (IL-6/gp130), integrins, and immune receptors (FcεRI/Kit) in a Lyn/Fyn/Src-dependent manner, and phosphorylates a defined set of substrates — including cortactin (promoting actin polymerization and cell migration), β-catenin Tyr-142 (disrupting α-catenin association), PTP1B Tyr-152 (maintaining cadherin complex integrity), PECAM-1 ITIMs, CRMP2 Tyr-479/Tyr-499 (preventing microtubule bundling), MET Tyr-1349 (activating RAC1-PAK1-GAB1-SHP2-ERK), IRS4 Tyr-779 (recruiting PI3K-AKT), Vav2 Tyr-172 (stimulating Rac GEF activity), PKCδ Tyr-374 (blocking late endosome maturation and EGFR degradation), STAT3 (via SH2-domain interaction), and AR Tyr-223 — thereby regulating adherens junction stability, cell motility, invasion, metastasis, synaptic development, sperm capacitation, and innate immune cell recruitment."},"narrative":{"mechanistic_narrative":"FER is a cytoplasmic non-receptor tyrosine kinase that integrates signals from growth factor, cytokine, integrin, and immune receptors to control cell adhesion, actin-based motility, and cell-cycle progression [PMID:7623846, PMID:17606629, PMID:19147545]. Its kinase activity depends on a conserved catalytic aspartate (D743) [PMID:10195287], and full activation is potentiated by N-terminal coiled-coil-driven trimerization that enables autophosphorylation in trans [PMID:10391941]; c-Src and Fyn initiate FER activation, and the testis-specific FerT isoform lacks the N-terminal oligomerization capacity [PMID:10391941, PMID:10921917, PMID:25867068]. A recurring functional module is FER's regulation of cadherin-based adherens junctions: FER constitutively binds p120 catenin and is thereby recruited to cadherin complexes, where it phosphorylates β-catenin at Tyr-142 to disrupt α-catenin association, and phosphorylates PTP1B at Tyr-152 to maintain β-catenin dephosphorylation and junction integrity [PMID:7623846, PMID:12640114, PMID:15226396]. In the actin cytoskeleton, FER directly binds cortactin through its SH2 domain and phosphorylates it downstream of growth factors, osmotic stress, ROS-coupled integrin engagement, and phosphatidic acid binding to its FX domain, driving lamellipodia formation, N-cadherin immobilization, and cell migration [PMID:9722593, PMID:10921917, PMID:15030313, PMID:16176974, PMID:19738202]; cortactin is a genetically validated in vivo FER substrate [PMID:11134346]. FER additionally phosphorylates a defined substrate set that links it to distinct pathways — Vav2 Tyr-172 (Rac-GEF activation and metastasis) [PMID:23699534], MET Tyr-1349 (RAC1/PAK1 and SHP2-ERK signaling) [PMID:27401557], IRS4 Tyr-779 (PI3K-AKT activation) [PMID:35550247], PKCδ Tyr-374 (blocking late-endosome maturation and EGFR degradation) [PMID:33411917], CRMP2 Tyr-479/499 (preventing microtubule bundling) [PMID:29396402], LRP6 (negatively regulating Wnt/β-catenin) [PMID:25391905], and PECAM-1 ITIMs in mast cells downstream of FcεRI/Lyn [PMID:16731527]. FER also acts kinase-independently as a STAT3 adaptor via its SH2 domain in IL-6/gp130 and PDGFRβ signaling [PMID:19147545, PMID:23589302], and it controls synapse formation through a p120ctn→FER→SHP-2→β-catenin presynaptic pathway [PMID:19047464]. Genetic knock-in of catalytically dead FER establishes its requirement for sperm capacitation-associated tyrosine phosphorylation and fertilization [PMID:27226326], and oncogenic activation occurs through a Golgi-localized MAN2A1-FER fusion with elevated kinase activity [PMID:28245430].","teleology":[{"year":1991,"claim":"Established the basic subcellular distribution of FER protein, the first step toward placing it in a cellular compartment.","evidence":"Subcellular fractionation and immunofluorescence","pmids":["1990274"],"confidence":"Medium","gaps":["Nuclear/chromatin association was later contradicted by live-cell imaging","No functional consequence of localization established"]},{"year":1995,"claim":"Identified the constitutive p120 catenin interaction and growth-factor-coupled activation, defining FER as a receptor-linked kinase that docks at the catenin complex.","evidence":"Co-IP and oligomerization assays with EGF/PDGF stimulation in A431 cells and fibroblasts","pmids":["7623846"],"confidence":"High","gaps":["Did not identify catalytic substrates","Mechanism of growth-factor-induced activation unresolved"]},{"year":1998,"claim":"Defined cortactin as a direct SH2-domain-bound substrate and TMF as a further substrate, linking FER catalytic activity to actin regulation.","evidence":"SH2-domain binding mapping, dominant-negative mutant, kinase assays, and yeast two-hybrid (TMF)","pmids":["9722593","9742951"],"confidence":"High","gaps":["Site of cortactin phosphorylation not yet mapped","Physiological context of TMF phosphorylation unclear"]},{"year":1998,"claim":"Showed that FER overexpression disrupts adherens junctions, connecting FER activity to loss of cell-cell adhesion and detachment.","evidence":"Tetracycline-regulatable overexpression with co-IP and phosphotyrosine blotting in fibroblasts","pmids":["9742093"],"confidence":"High","gaps":["Did not pinpoint which phosphorylation event drives junction dissolution","Overexpression may exceed physiological levels"]},{"year":1999,"claim":"Resolved how FER achieves activation, defining coiled-coil-driven trimerization that potentiates trans-autophosphorylation and a catalytic aspartate essential for activity.","evidence":"Gel filtration, deletion-mutant kinase assays, and active-site mutagenesis with structural modeling","pmids":["10391941","10195287"],"confidence":"High","gaps":["Oligomerization shown not strictly required for activation","Upstream trigger of oligomerization in cells not defined"]},{"year":2000,"claim":"Placed FER downstream of Src-family kinases (Fyn) and defined the STAT3 adaptor function, distinguishing N-terminal-dependent activities from the shared kinase domain.","evidence":"Fyn/Src-deficient MEFs, cortactin site mutagenesis, chimeric N-terminal swaps, and N-cadherin/integrin peptide competition","pmids":["10921917","10878010","10998246","10851023"],"confidence":"High","gaps":["STAT3 activation mechanism via N-terminus not fully resolved","Cadherin-integrin crosstalk shown only by peptide competition"]},{"year":2001,"claim":"Genetic knock-in of kinase-dead Fer(D743R) established cortactin as a specific in vivo substrate and showed FER is dispensable for viability and fertility, while live imaging revised its localization to cytoplasmic.","evidence":"Fer(D743R) knock-in mice, phospho-substrate blotting, and GFP-Fer confocal imaging","pmids":["11134346","11339827"],"confidence":"High","gaps":["β-catenin and p120ctn phosphorylation found unaffected in vivo, leaving their physiological FER-dependence open","Functional redundancy with Fps/Fes not excluded"]},{"year":2002,"claim":"Extended FER into immune signaling and revealed negative regulation, placing it downstream of FcεRI for sustained p38 and showing plectin restrains its activity.","evidence":"Knock-in mast cells with migration/degranulation assays and plectin-null fibroblast kinase assays","pmids":["12192036","12200133"],"confidence":"High","gaps":["Mechanism of plectin-mediated inhibition unclear","How FER selectively sustains p38 not defined"]},{"year":2003,"claim":"Defined site-specific substrates at junctions and microtubules — β-catenin Tyr-142 and PECAM-1 ITIM/Tyr-700 — and the p120ctn docking that couples FER to Yes and oncogenic K-ras.","evidence":"In vitro kinase assays, K-ras transfectants, expression cloning, GFP-Fer live imaging, and testis co-IP panels","pmids":["12640114","12972546","12700184"],"confidence":"High","gaps":["In vivo relevance of β-catenin Tyr-142 phosphorylation not established in physiological settings","PECAM-1 phosphorylation consequences for downstream signaling incompletely mapped"]},{"year":2004,"claim":"Mechanistically linked FER to cadherin complex stability via PTP1B Tyr-152 and to actin dynamics, showing actin depolymerization promotes FER-cortactin association.","evidence":"Domain mapping, peptide competition, phospho-mutant rescue in fer(D743R) MEFs, and latrunculin B treatment with cortactin deletion mapping","pmids":["15226396","15030313"],"confidence":"High","gaps":["Cortactin C-terminal phosphorylation functional output not fully resolved here","Coupling of actin state to FER recruitment mechanism unclear"]},{"year":2005,"claim":"Demonstrated that FER-mediated cortactin phosphorylation functionally strengthens intercellular adhesion by immobilizing N-cadherin at nascent contacts.","evidence":"FRAP, shear adhesion assays, and N-cadherin bead pulldowns in fer(D743R) MEFs","pmids":["16176974"],"confidence":"High","gaps":["Quantitative link between cortactin phospho-level and adhesion strength not fully dissected","Relationship to FER's junction-disrupting overexpression phenotype unreconciled"]},{"year":2006,"claim":"Placed FER in the Lyn→FER→PECAM-1 immune axis and revealed a cell-cycle role through PP1α regulation of pRB phosphorylation.","evidence":"Lyn-null and fer/fps-null mast cells; RNAi with PP1α activity and pRB phosphorylation assays in carcinoma cells","pmids":["16731527","16732323"],"confidence":"Medium","gaps":["FER-PP1α interaction shown in single lab without genetic validation","Whether PP1α regulation is kinase-dependent unclear"]},{"year":2007,"claim":"Coupled FER to integrin/ROS-driven migration and to Semaphorin-mediated axon retraction, identifying CRMP2 and tubulin as neuronal substrates.","evidence":"Fibronectin/H2O2 stimulation in fer(DR/DR) MEFs; Sema3A retraction in fer-mutant DRG neurons with in vitro kinase assays","pmids":["17606629","18053124"],"confidence":"High","gaps":["CRMP2 phosphorylation sites not yet defined at this stage","How ROS activates FER mechanistically unresolved"]},{"year":2008,"claim":"Established a presynaptic p120ctn→FER→SHP-2→β-catenin pathway required for excitatory synapse formation, defining FER's role in neuronal development.","evidence":"Fer shRNA in hippocampal neurons with epistasis rescue and electrophysiology","pmids":["19047464"],"confidence":"High","gaps":["Direct FER substrate within this pathway not identified","Relationship to FER kinase activity vs adaptor role unclear"]},{"year":2009,"claim":"Identified a lipid-sensing FX domain that targets FER to phosphatidic acid and the IL-6/gp130 route to STAT3, broadening activation inputs.","evidence":"Lipid-binding assays with FX-domain mutants and migration assays; IL-6-induced Fer/gp130/STAT3 co-IP with bidirectional manipulation","pmids":["19738202","19147545"],"confidence":"Medium","gaps":["FX-PA interaction structurally uncharacterized","STAT3 activation kinase-dependence not resolved here"]},{"year":2010,"claim":"Defined NRP1 as a direct FER partner transducing Sema3A-induced neuronal death and axon retraction with in vivo ischemia relevance.","evidence":"NRP1-Fer co-IP, Fer siRNA in cortical neurons, and a mouse cerebral ischemia model","pmids":["20133938"],"confidence":"Medium","gaps":["Single-lab co-IP without reciprocal structural validation","FER substrate downstream of NRP1 not identified"]},{"year":2011,"claim":"Linked FER overexpression to EGFR-driven NF-κB activation and chemoresistance, connecting FER to receptor-proximal oncogenic signaling.","evidence":"Insertional mutagenesis screen, FER-EGFR co-IP, siRNA, and drug-resistance readouts","pmids":["21518868"],"confidence":"Medium","gaps":["FER-EGFR interaction shown only by overexpression co-IP","Whether NF-κB activation requires FER kinase activity unclear"]},{"year":2013,"claim":"Established FER as a metastasis driver via Vav2 Tyr-172/Rac, as a kinase-independent PDGFRβ-STAT3 adaptor, and as an AR regulator, distinguishing scaffolding from catalytic functions.","evidence":"shRNA knockdown with Vav2 phospho-assay, Rac-GTP pulldown, metastasis models; PDGFRβ autophosphorylation-site mapping; Fer-AR SH2 interaction with PSA reporter","pmids":["23699534","23589302","23906537"],"confidence":"High","gaps":["Mechanism of kinase-independent STAT3 activation incompletely resolved","AR regulation shown in single lab"]},{"year":2014,"claim":"Showed FER (with Src) directly phosphorylates LRP6 to negatively regulate Wnt/β-catenin signaling, adding a developmental signaling axis with CK1γ counter-regulation.","evidence":"Direct in vitro phosphorylation, fer/src-null MEF Wnt reporters, and epistasis analysis","pmids":["25391905"],"confidence":"High","gaps":["LRP6 phospho-site consequences for Wnt receptor function partly inferred","Tissue context of FER-LRP6 regulation undefined"]},{"year":2015,"claim":"Reconstructed a Src→FER→ezrin activation cascade at focal adhesions required for transformation, mechanistically connecting FER activation to invasiveness.","evidence":"c-Src-Fer co-IP at focal adhesions, in vitro ezrin phosphorylation, and transformation/invasion assays","pmids":["25867068"],"confidence":"Medium","gaps":["Single-lab demonstration of the Src-FER-ezrin axis","Ezrin phospho-site not defined"]},{"year":2016,"claim":"Identified MET Tyr-1349 as a FER substrate driving RAC1/SHP2-ERK metastasis and established FER's requirement for sperm capacitation-associated phosphorylation and fertilization.","evidence":"FER-MET co-IP and site-specific phosphorylation with metastasis models; Fer kinase-dead and Pyk2-null mice with IVF assays","pmids":["27401557","27226326"],"confidence":"High","gaps":["Mechanism distinguishing FER's MET scaffolding from kinase function partly inferred","Capacitation substrates of FER in sperm not enumerated"]},{"year":2017,"claim":"Defined oncogenic activation through a Golgi-localized MAN2A1-FER fusion with elevated kinase activity, and revealed FER/FerT mitochondrial association coupled to PARP-1 in cancer metabolism.","evidence":"Fusion-protein expression with Golgi fractionation and EGFR pY88 assay; mitochondrial fractionation, E260 inhibitor, and Fer-PARP-1 co-IP","pmids":["28245430","29038547"],"confidence":"Medium","gaps":["FER-PARP-1 mitochondrial mechanism from single lab","Structural basis of fusion-driven hyperactivity undefined"]},{"year":2018,"claim":"Resolved at atomic resolution how FER phosphorylation of CRMP2 Tyr-479/499 blocks tetramerization and microtubule bundling, providing a structural mechanism with chemotherapy-sensitization relevance.","evidence":"In vitro phosphorylation, X-ray crystallography of CRMP2 and phosphomimetic, microtubule bundling assays, and xenografts","pmids":["29396402"],"confidence":"High","gaps":["In vivo stoichiometry of CRMP2 phosphorylation not quantified","Generality across CRMP family unaddressed"]},{"year":2019,"claim":"Identified YY1 as a direct transcriptional repressor of FER, placing FER within a STAT3-MMP2 invasion axis in pancreatic cancer.","evidence":"Luciferase, EMSA, ChIP, and FER-knockdown epistasis with invasion assays","pmids":["31404611"],"confidence":"Medium","gaps":["Single-lab transcriptional regulation","Whether FER-STAT3-MMP2 link requires kinase activity unclear"]},{"year":2021,"claim":"Defined FER phosphorylation of PKCδ Tyr-374 as a switch blocking RAB5→RAB7 conversion to inhibit EGFR lysosomal degradation, with PTPN14 as the counteracting phosphatase.","evidence":"In vitro kinase assay, endosome fractionation, RAB5/RAB7 imaging, PTPN14 dephosphorylation, and TNBC tissue analysis","pmids":["33411917"],"confidence":"High","gaps":["How phospho-PKCδ mechanistically retains RAB5 not fully resolved","In vivo relevance of the EGFR-recycling phenotype limited to tissue correlation"]},{"year":2022,"claim":"Established IRS4 Tyr-779 as a FER substrate recruiting PI3K/p85β to drive AKT signaling and ovarian cancer proliferation, mapping the kinase-domain–IRS4 interaction.","evidence":"Mass spectrometry, BioID, kinase-domain–IRS4 co-IP, phospho-mutant rescue, and xenografts","pmids":["35550247"],"confidence":"High","gaps":["Selectivity of FER for IRS4 over other IRS proteins not fully addressed","Upstream receptor coupling to FER-IRS4 in ovarian cancer undefined"]},{"year":null,"claim":"How FER integrates its many context-specific inputs and substrate choices into coherent signaling decisions, and the structural basis for its scaffolding versus catalytic functions, remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No full-length structural model integrating F-BAR/FX, coiled-coil, SH2, and kinase domains","Substrate-selection logic across tissues unexplained","Mechanism switching FER between kinase and adaptor modes undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[1,6,14,17,28,31,35,37,38]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[5,6,14,31,35,37,38]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,21,25,27]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[25,29]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[1,18,19]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[24]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[2,11]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[15,16,22]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[7,16,37]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[37]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[34]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[33]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,25,29,31,38]},{"term_id":"R-HSA-1474244","term_label":"Extracellular matrix organization","supporting_discovery_ids":[0,3,14,17,19]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[12,20]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[40]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[22,23,26]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[28,31,33,38]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[37]}],"complexes":["cadherin/catenin adherens junction complex","PDGFRβ–p85 PI3K complex","gp130–STAT3 complex"],"partners":["CTNND1","CTTN","STAT3","FYN","SRC","MET","EGFR","IRS4"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P16591","full_name":"Tyrosine-protein kinase Fer","aliases":["Feline encephalitis virus-related kinase FER","Fujinami poultry sarcoma/Feline sarcoma-related protein Fer","Proto-oncogene c-Fer","Tyrosine kinase 3","p94-Fer"],"length_aa":822,"mass_kda":94.6,"function":"Tyrosine-protein kinase that acts downstream of cell surface receptors for growth factors and plays a role in the regulation of the actin cytoskeleton, microtubule assembly, lamellipodia formation, cell adhesion, cell migration and chemotaxis. Acts downstream of EGFR, KIT, PDGFRA and PDGFRB. Acts downstream of EGFR to promote activation of NF-kappa-B and cell proliferation. May play a role in the regulation of the mitotic cell cycle. Plays a role in the insulin receptor signaling pathway and in activation of phosphatidylinositol 3-kinase. Acts downstream of the activated FCER1 receptor and plays a role in FCER1 (high affinity immunoglobulin epsilon receptor)-mediated signaling in mast cells. Plays a role in the regulation of mast cell degranulation. Plays a role in leukocyte recruitment and diapedesis in response to bacterial lipopolysaccharide (LPS). Plays a role in synapse organization, trafficking of synaptic vesicles, the generation of excitatory postsynaptic currents and neuron-neuron synaptic transmission. Plays a role in neuronal cell death after brain damage. Phosphorylates CTTN, CTNND1, PTK2/FAK1, GAB1, PECAM1 and PTPN11. May phosphorylate JUP and PTPN1. Can phosphorylate STAT3, but the biological relevance of this depends on cell type and stimulus","subcellular_location":"Cytoplasm; Cytoplasm, cytoskeleton; Cell membrane; Cell projection; Cell junction; Membrane; Nucleus; Cytoplasm, cell cortex","url":"https://www.uniprot.org/uniprotkb/P16591/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/FER","classification":"Not Classified","n_dependent_lines":3,"n_total_lines":1208,"dependency_fraction":0.0024834437086092716},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/FER","total_profiled":1310},"omim":[{"mim_id":"613438","title":"FCH DOMAIN ONLY PROTEIN 2; FCHO2","url":"https://www.omim.org/entry/613438"},{"mim_id":"613437","title":"FCH DOMAIN ONLY PROTEIN 1; FCHO1","url":"https://www.omim.org/entry/613437"},{"mim_id":"611731","title":"APC REGULATOR OF WNT SIGNALING PATHWAY; APC","url":"https://www.omim.org/entry/611731"},{"mim_id":"606525","title":"SLIT-ROBO RHO GTPase-ACTIVATING PROTEIN 3; SRGAP3","url":"https://www.omim.org/entry/606525"},{"mim_id":"606524","title":"SLIT-ROBO RHO GTPase-ACTIVATING PROTEIN 2; SRGAP2","url":"https://www.omim.org/entry/606524"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Cytosol","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/FER"},"hgnc":{"alias_symbol":["TYK3","PPP1R74"],"prev_symbol":[]},"alphafold":{"accession":"P16591","domains":[{"cath_id":"1.20.1270.60","chopping":"11-232","consensus_level":"medium","plddt":93.6864,"start":11,"end":232},{"cath_id":"3.30.505.10","chopping":"454-548","consensus_level":"high","plddt":91.3193,"start":454,"end":548},{"cath_id":"3.30.200.20","chopping":"553-639","consensus_level":"medium","plddt":88.9133,"start":553,"end":639},{"cath_id":"1.10.510.10","chopping":"643-822","consensus_level":"medium","plddt":92.4517,"start":643,"end":822},{"cath_id":"1.20.58","chopping":"301-340_361-391","consensus_level":"medium","plddt":93.8851,"start":301,"end":391}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P16591","model_url":"https://alphafold.ebi.ac.uk/files/AF-P16591-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P16591-F1-predicted_aligned_error_v6.png","plddt_mean":87.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=FER","jax_strain_url":"https://www.jax.org/strain/search?query=FER"},"sequence":{"accession":"P16591","fasta_url":"https://rest.uniprot.org/uniprotkb/P16591.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P16591/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P16591"}},"corpus_meta":[{"pmid":"9731527","id":"PMC_9731527","title":"A gene related to Caenorhabditis elegans spermatogenesis factor fer-1 is mutated in limb-girdle muscular dystrophy type 2B.","date":"1998","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/9731527","citation_count":567,"is_preprint":false},{"pmid":"28104890","id":"PMC_28104890","title":"The receptor kinase FER is a RALF-regulated scaffold controlling plant immune signaling.","date":"2017","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/28104890","citation_count":531,"is_preprint":false},{"pmid":"10192385","id":"PMC_10192385","title":"A mutation in OTOF, encoding otoferlin, a FER-1-like protein, causes DFNB9, a nonsyndromic form of deafness.","date":"1999","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/10192385","citation_count":439,"is_preprint":false},{"pmid":"12640114","id":"PMC_12640114","title":"p120 Catenin-associated Fer and Fyn tyrosine kinases regulate beta-catenin Tyr-142 phosphorylation and beta-catenin-alpha-catenin Interaction.","date":"2003","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/12640114","citation_count":281,"is_preprint":false},{"pmid":"12370409","id":"PMC_12370409","title":"The tomato fer gene encoding a bHLH protein controls iron-uptake responses in roots.","date":"2002","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/12370409","citation_count":248,"is_preprint":false},{"pmid":"11994747","id":"PMC_11994747","title":"Closing in on the biological functions of Fps/Fes and Fer.","date":"2002","source":"Nature reviews. 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vivo.","date":"2000","source":"Biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/10998246","citation_count":16,"is_preprint":false},{"pmid":"30909648","id":"PMC_30909648","title":"Targeting FER Kinase Inhibits Melanoma Growth and Metastasis.","date":"2019","source":"Cancers","url":"https://pubmed.ncbi.nlm.nih.gov/30909648","citation_count":15,"is_preprint":false},{"pmid":"15567065","id":"PMC_15567065","title":"Fer kinase sustains the activation level of ERK1/2 and increases the production of VEGF in hypoxic cells.","date":"2005","source":"Cellular signalling","url":"https://pubmed.ncbi.nlm.nih.gov/15567065","citation_count":15,"is_preprint":false},{"pmid":"29099290","id":"PMC_29099290","title":"FER mediated HGF-independent regulation of HGFR/MET activates RAC1-PAK1 pathway to potentiate metastasis in ovarian cancer.","date":"2018","source":"Small GTPases","url":"https://pubmed.ncbi.nlm.nih.gov/29099290","citation_count":15,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":48672,"output_tokens":10962,"usd":0.155223,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":21867,"output_tokens":8006,"usd":0.154743,"stage2_stop_reason":"end_turn"},"total_usd":0.309966,"stage1_batch_id":"msgbatch_01AsR7g8dGTEiEw9U83bJeWn","stage2_batch_id":"msgbatch_01YV5ZyxtFNUZEjxRcpd9jzb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1995,\n      \"finding\": \"FER kinase constitutively associates with pp120 (p120 catenin) through a ~400 amino acid coiled-coil sequence in its amino terminus; growth factor (EGF, PDGF) stimulation induces phosphorylation of FER and associated pp120 and growth factor receptors.\",\n      \"method\": \"Co-immunoprecipitation, in vitro oligomerization assay, growth factor stimulation of A431 cells and 3T3 fibroblasts\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP, domain mapping, and functional stimulation assays in a single focused study\",\n      \"pmids\": [\"7623846\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"FER kinase directly binds cortactin through its SH2 domain, and FER kinase activity is required for growth factor-dependent phosphorylation of cortactin; a dominant-negative FER mutant blocks this phosphorylation.\",\n      \"method\": \"Co-immunoprecipitation, subcellular fractionation, dominant-negative mutant expression, in vitro kinase assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding mapped to SH2 domain, dominant-negative functional validation, multiple orthogonal methods in one study\",\n      \"pmids\": [\"9722593\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"FER protein is present in both the cytoplasm and nucleus, where it associates with the chromatin fraction.\",\n      \"method\": \"Subcellular fractionation, immunofluorescence\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — two orthogonal localization methods but single study with no direct functional consequence linked\",\n      \"pmids\": [\"1990274\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Overexpression of FER in embryonic fibroblasts induces cell rounding and detachment from substratum, coincident with increased FER–p120(cas) complex formation, tyrosine phosphorylation of p120(cas) and β-catenin, and dissolution of E-cadherin/α-catenin/β-catenin adherens junction complexes.\",\n      \"method\": \"Tetracycline-regulatable overexpression system, co-immunoprecipitation, phosphotyrosine Western blotting\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — inducible overexpression with quantitative loss of adherens junction co-IP and specific phosphorylation readouts\",\n      \"pmids\": [\"9742093\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"FER forms trimers in vivo via cooperative interaction of its first and second coiled-coil domains; disruption of either domain abolishes oligomerization. Oligomerization potentiates autophosphorylation in trans at three major sites, but is not required for kinase activation. The testis-specific FerT isoform does not oligomerize.\",\n      \"method\": \"Gel filtration, co-immunoprecipitation, in vitro kinase assay with deletion mutants\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — multiple domain mutants, biochemical reconstitution of oligomerization, autophosphorylation mapping, comparison with FerT\",\n      \"pmids\": [\"10391941\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Mutation of the conserved aspartate (D743R) in subdomain IX of FER's kinase domain abolishes catalytic activity; structural modeling indicates this is due to van der Waals repulsion disrupting the catalytic loop.\",\n      \"method\": \"Active-site mutagenesis, in vitro kinase assay in mammalian cells and bacteria, structural modeling\",\n      \"journal\": \"Protein engineering\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — catalytic-dead mutagenesis validated in two expression systems with structural rationale\",\n      \"pmids\": [\"10195287\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"FER is a downstream target of Fyn kinase in the osmotic stress response: cell shrinkage activates FER in a Fyn-dependent (but Src-independent) manner, and activated FER phosphorylates cortactin at tyrosines 421, 466, and 482. FER also mediates Fyn-dependent phosphorylation of β-catenin, α-catenin, and p120(Cas) upon shrinkage, causing dissociation of β-catenin from cell-cell contacts.\",\n      \"method\": \"Kinase activity assays, Fyn/Src-deficient MEFs, site-directed mutagenesis of cortactin tyrosines, co-immunoprecipitation, Src family inhibitor PP2\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic (kinase-null cells) and pharmacological evidence, site-specific mutagenesis, multiple substrates confirmed, replicated in multiple cell types\",\n      \"pmids\": [\"10921917\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"FER mediates cross-talk between N-cadherin and β1-integrins: displacement of FER from the N-cadherin juxtamembrane complex (by a competing peptide) causes FER to relocate to the β1-integrin complex, inhibiting both N-cadherin and β1-integrin function. A peptide matching FER's first coiled-coil domain prevents FER accumulation in the integrin complex.\",\n      \"method\": \"Trojan peptide competition in cells and tissues, co-immunoprecipitation, cadherin- and integrin-mediated adhesion assays, neurite outgrowth assay\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — peptide competition with domain specificity and functional adhesion readouts, single lab\",\n      \"pmids\": [\"10851023\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"p94(fer) (but not p51(ferT)) activates STAT3 by direct tyrosine phosphorylation; endogenous STAT3 and p94(fer) co-immunoprecipitate. The ability to activate STAT3 is determined by the N-terminal sequence of p94(fer), not by its SH2/kinase domains shared with FerT.\",\n      \"method\": \"Co-immunoprecipitation, double immunofluorescence, in vivo phosphorylation assay, chimeric kinase swapping of N-terminal sequences\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP of endogenous proteins confirmed, domain-swap experiments defining N-terminal specificity, multiple orthogonal methods\",\n      \"pmids\": [\"10878010\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"N-terminal coiled-coil domains of p94(fer) direct oligomerization and autophosphorylation in trans in vivo; the unique N-terminal 43-aa of p51(ferT) prevents its autophosphorylation. The N-terminal tail of p94(fer) expressed ectopically acts as a dominant negative and increases the G0/G1 fraction.\",\n      \"method\": \"In vivo autophosphorylation assays, N-terminal deletion and chimeric mutants, cell cycle analysis\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple mutant constructs, cell cycle readout, single lab\",\n      \"pmids\": [\"10998246\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Mice homozygous for kinase-inactivating Fer(D743R) mutation are viable and fertile; cortactin phosphorylation is specifically reduced in PDGF-stimulated fer(D743R) MEFs, while phosphorylation of STAT3, p120(ctn), and β-catenin is unaffected, establishing cortactin as a specific Fer substrate in vivo.\",\n      \"method\": \"Knock-in mouse model, Western blotting of phospho-substrates in MEFs, PDGF/EGF stimulation\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knock-in model, substrate-specific phosphorylation analysis, multiple stimuli and substrates tested\",\n      \"pmids\": [\"11134346\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Fer kinase is diffusely cytoplasmic (not nuclear) throughout the cell cycle when tracked by GFP fusion and confocal microscopy, in contrast to earlier fractionation reports.\",\n      \"method\": \"GFP fusion, confocal fluorescence microscopy, cell cycle synchronization\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — live-cell imaging, single lab, contradicts earlier fractionation data\",\n      \"pmids\": [\"11339827\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Fer kinase is activated downstream of FcεRI aggregation in mast cells and is required for sustained (not initial) p38 MAPK activation; Fer-deficient mast cells show increased adhesion and decreased migration upon FcεRI/Kit activation.\",\n      \"method\": \"Bone marrow-derived mast cells from fer(DR/DR) knock-in mice, kinase activity assay, p38/ERK phosphorylation Western blotting, degranulation and migration assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knock-in model, multiple functional and biochemical readouts, pathway placement via p38\",\n      \"pmids\": [\"12192036\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Plectin directly binds the N-terminal domain (aa 1–329) of Fer kinase; this interaction negatively regulates Fer catalytic activity, as Fer is hyperphosphorylated and hyperactive in plectin-null fibroblasts.\",\n      \"method\": \"Recombinant protein pulldown, co-immunoprecipitation from fibroblast lysates, immunocomplex kinase assay in plectin-null vs wild-type cells\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding confirmed with recombinant proteins and endogenous co-IP, kinase activity measured in genetic null background\",\n      \"pmids\": [\"12200133\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Fer phosphorylates β-catenin at Tyr-142 in vitro, disrupting the β-catenin–α-catenin interaction; in K-ras–expressing cells, Fer is activated and Tyr-142 phosphorylation is increased. Fer is constitutively bound to p120 catenin, which acts as a docking protein facilitating Fer activation by Yes kinase.\",\n      \"method\": \"In vitro kinase assay, stable K-ras transfectants, co-immunoprecipitation, phosphospecific antibodies\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro phosphorylation at defined residue, genetic cell model, multiple orthogonal methods\",\n      \"pmids\": [\"12640114\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Fer kinase phosphorylates PECAM-1 at its ITIM motif and at Tyr-700; Fer is localized on growing microtubules in vascular endothelial cells where it co-localizes with p120 catenin at nascent cell-cell contacts, and a kinase-dead Fer mutant blocks PECAM-1 phosphorylation upon homophilic engagement.\",\n      \"method\": \"Expression cloning screen, in vitro kinase assay, dominant-negative mutant, GFP-Fer live-cell time-lapse microscopy\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — expression cloning identification, in vitro kinase validation, dominant-negative functional test, live-cell localization imaging\",\n      \"pmids\": [\"12972546\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Fer kinase associates with N-cadherin, γ-catenin, p120ctn, c-Src, Rab8, actin, and vimentin (but not E-cadherin, afadin, nectin-3, or integrin β1) in the testis, linking it specifically to N-cadherin/catenin-based adherens junctions and intermediate filament structures.\",\n      \"method\": \"Co-immunoprecipitation from testis/Sertoli cell lysates, immunohistochemistry with stage-specific localization\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — co-IP panel distinguishing binding partners, replicated across cell and tissue models, single lab\",\n      \"pmids\": [\"12700184\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Fer phosphorylates PTP1B at Tyr-152, enabling PTP1B to bind the cytoplasmic domain of cadherin and maintain β-catenin in a dephosphorylated state at Tyr-654; Fer interacts with cadherin indirectly through p120ctn. fer(D743R) fibroblasts lose cadherin-associated PTP1B and β-catenin at cell-cell contacts.\",\n      \"method\": \"Domain mapping (co-IP of Fer/p120ctn interaction domains), peptide competition in live cells, phospho-site mutant β-catenin rescue, analysis of fer(D743R) knock-in MEFs\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — domain mapping, peptide competition, phospho-mutant rescue, and genetic knock-in validation in one study\",\n      \"pmids\": [\"15226396\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Actin depolymerization (by latrunculin B) promotes Fer–cortactin association and Fer-mediated phosphorylation of cortactin C-terminal tyrosines; the N-terminal actin-binding domain of cortactin is required for efficient association with Fer and for phosphorylation of C-terminal tyrosines. This process is Fyn/Fer-dependent and Src/Abl-independent.\",\n      \"method\": \"Latrunculin B/jasplakinolide treatment, candidate kinase-deficient cell lines, co-immunoprecipitation, phospho-mapping of cortactin deletion mutants\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic kinase-null cells, multiple inhibitor/activator conditions, domain mapping of binding and phosphorylation\",\n      \"pmids\": [\"15030313\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"FER phosphorylates N-cadherin-associated cortactin, which promotes N-cadherin immobilization at nascent contacts and strengthens intercellular adhesion; in fer(D743R) fibroblasts, cortactin phosphorylation after N-cadherin ligation is reduced, GFP-N-cadherin mobility is faster (FRAP), and intercellular adhesion strength is halved.\",\n      \"method\": \"N-cadherin-coated bead pulldown, FRAP, shear wash-off adhesion assay, fer(D743R) MEFs\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple quantitative functional assays (FRAP, force measurement, pulldown) using genetic knock-in cells\",\n      \"pmids\": [\"16176974\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Fer and Fps/Fes kinases are activated downstream of FcεRI in a Lyn-dependent manner and phosphorylate PECAM-1 ITIMs and Tyr-700; mast cells lacking Fer/Fps show reduced FcεRI-induced PECAM-1 phosphorylation and exaggerated degranulation at low antigen doses.\",\n      \"method\": \"Kinase activity assay, in vitro phosphorylation of PECAM-1 C-terminus, ITIM phosphorylation in transfected cells, mast cells from Lyn-null and fer/fps kinase-null mice\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic null models, in vitro substrate validation, pathway placement (Lyn→Fer→PECAM-1)\",\n      \"pmids\": [\"16731527\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Fer mediates cortactin tyrosine phosphorylation downstream of integrin engagement in a ROS-dependent manner; fer(DR/DR) MEFs show reduced fibronectin-induced cortactin phosphorylation and impaired cell migration; ROS scavengers or NADPH oxidase inhibition attenuate Fer and cortactin phosphorylation.\",\n      \"method\": \"H2O2 stimulation, fibronectin engagement, fer(DR/DR) and Src/Yes/Fyn-null MEFs, NADPH oxidase inhibitor, wound-healing migration assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple genetic cell models, pharmacological validation of ROS link, migration functional readout\",\n      \"pmids\": [\"17606629\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Fer kinase is required for Sema3A-induced axon retraction in dorsal root ganglion neurons; Fer phosphorylates tubulin and CRMP2 in vitro; CRMP2 and PlexinA1 inhibit Fer autophosphorylation activity in vitro. DRG neurons from fer-deficient mice show significantly diminished axon retraction to Sema3A.\",\n      \"method\": \"fer(DR/DR) knock-in and fps-null DRG neuron cultures, Sema3A retraction assay, in vitro kinase assay (tubulin, CRMP2 substrates), autophosphorylation inhibition assay\",\n      \"journal\": \"BMC developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knock-in and knock-out neuron models, in vitro substrate identification, functional axon retraction assay\",\n      \"pmids\": [\"18053124\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Presynaptic Fer depletion prevents localization of active zone constituents and synaptic vesicles and inhibits excitatory synapse formation. Fer operates in a p120ctn→Fer→SHP-2→β-catenin presynaptic pathway; depletion of p120ctn or SHP-2 similarly disrupts synaptic vesicle localization, and active SHP-2 or β-catenin overexpression rescues synapse formation in the absence of Fer.\",\n      \"method\": \"Fer shRNA in hippocampal neurons, epistasis rescue experiments with SHP-2 and β-catenin, immunofluorescence for active zone/synaptic vesicle markers, electrophysiology\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic pathway placement by epistasis/rescue, multiple neuronal readouts including electrophysiology\",\n      \"pmids\": [\"19047464\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Phosphatidic acid (PA) binds to an FX (F-BAR extension) domain in Fer, adjacent to its F-BAR domain, and enhances Fer-mediated phosphorylation of cortactin; Fer overexpression enhances lamellipodia formation and cell migration in a PLD-activity- and PA–FX interaction-dependent manner.\",\n      \"method\": \"Lipid-binding assay, identification of FX domain, cortactin phosphorylation assay, lamellipodia imaging, cell migration assay with PLD inhibitor\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — novel domain identified with lipid-binding validation, domain mutant, functional migration readout in one study\",\n      \"pmids\": [\"19738202\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"FER activates STAT3 via the IL-6/gp130 pathway: IL-6 triggers rapid formation of Fer/gp130 and Fer/STAT3 complexes, and FER's SH2 domain mediates interaction with STAT3. Modulating FER expression bidirectionally controls STAT3 phosphorylation, nuclear translocation, and IL-6-mediated prostate cancer cell growth.\",\n      \"method\": \"Co-immunoprecipitation (Fer/STAT3, Fer/gp130), siRNA knockdown and overexpression, nuclear fractionation, cell proliferation assay\",\n      \"journal\": \"Molecular cancer research : MCR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP with endogenous proteins, domain identification (SH2), bidirectional functional manipulation, single lab\",\n      \"pmids\": [\"19147545\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Neuropilin-1 (NRP1) directly and selectively interacts with FER kinase to transduce Sema3A-induced cortical neuron death and axonal retraction; Fer RNAi attenuates Sema3A-induced neurite retraction and neuronal death, and reduces cerebral ischemia-induced brain damage in vivo.\",\n      \"method\": \"Co-immunoprecipitation (NRP1–Fer), Fer siRNA, cortical neuron culture Sema3A assay, mouse focal cerebral ischemia model\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct interaction co-IP, loss-of-function in neurons and in vivo, single lab\",\n      \"pmids\": [\"20133938\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"FER overexpression activates NF-κB through EGF receptor signaling: FER binds EGFR (co-IP), FER overexpression increases EGFR and ERK phosphorylation, and FER-mediated NF-κB activation confers resistance to quinacrine; ERK inhibition or FER knockdown blocks EGF-induced NF-κB activation.\",\n      \"method\": \"Insertional mutagenesis screen, cDNA overexpression, co-immunoprecipitation of FER–EGFR, siRNA knockdown, ERK/EGFR phosphorylation Western blotting\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct FER–EGFR co-IP, bidirectional manipulation, functional drug-resistance readout, single lab\",\n      \"pmids\": [\"21518868\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"FER phosphorylates Vav2 at Tyr-172 downstream of EGFR signaling in lung adenocarcinoma cells, which increases Vav2 GEF activity; FER knockdown reduces Rac-GTP localization to lamellipodia, impairs cell migration and invasion in vitro, and reduces spontaneous metastasis in vivo without affecting tumor growth.\",\n      \"method\": \"Stable shRNA knockdown, in vitro Fer–Vav2 phosphorylation assay, Rac-GTP pull-down, invasion assay, subcutaneous tumor/spontaneous metastasis mouse model\",\n      \"journal\": \"Molecular cancer research : MCR\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct substrate phosphorylation at defined site, genetic KD with multiple in vitro and in vivo functional readouts\",\n      \"pmids\": [\"23699534\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"FER associates with the PDGF β-receptor through multiple autophosphorylation sites (Tyr-579, Tyr-581, Tyr-740, Tyr-1021); FER kinase-independently (as an adaptor) promotes PDGF-BB-induced STAT3 phosphorylation (not STAT5, ERK1/2, or Akt), and is required for anchorage-independent growth and in vivo tumor formation.\",\n      \"method\": \"Co-immunoprecipitation (Fer–PDGFRβ), siRNA knockdown, kinase-dead Fer expression, STAT3/STAT5/ERK/Akt phosphorylation Western blotting, soft agar colony assay, xenograft\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — receptor-kinase binding sites mapped, kinase-dead adaptor function demonstrated, specific substrate selectivity established, in vivo validation\",\n      \"pmids\": [\"23589302\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Src and Fer directly associate with LRP6 and phosphorylate it on conserved tyrosine residues adjacent to PPPSPxS motifs, negatively regulating Wnt/β-catenin signaling; MEFs lacking Src and Fer show enhanced Wnt signaling. CK1γ inhibits Fer-induced LRP6 phosphorylation, suggesting a de-repression mechanism.\",\n      \"method\": \"cDNA expression screen, co-immunoprecipitation (Fer–LRP6), direct in vitro phosphorylation assay, fer/src-null MEFs (Wnt reporter), epistasis analysis\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — direct phosphorylation demonstrated in vitro, genetic null MEFs for epistasis, pathway placement relative to β-catenin\",\n      \"pmids\": [\"25391905\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"FER phosphorylates MET (HGFR) at Tyr-1349 in a HGF-ligand- and MET-autophosphorylation-independent manner; this activates RAC1/PAK1 and promotes a kinase-independent MET scaffolding function leading to GAB1 recruitment and phosphorylation, and specific SHP2-ERK pathway activation, driving ovarian cancer metastasis in vitro and in vivo.\",\n      \"method\": \"Co-immunoprecipitation (FER–MET), site-specific phosphorylation assay at MET Tyr-1349, RNAi knockdown of FER, RAC1-GTP pull-down, in vivo ovarian cancer metastasis model\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — novel substrate (MET) and phosphorylation site defined, scaffolding vs kinase functions distinguished, downstream pathway mapped, in vivo validation\",\n      \"pmids\": [\"27401557\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"FER kinase is responsible for the capacitation-associated increase in sperm tyrosine phosphorylation: Fer kinase-inactivating knock-in mice (but not Pyk2-null mice) fail to show capacitation-associated tyrosine phosphorylation increases, and their sperm display reduced in vitro fertilization ability.\",\n      \"method\": \"Fer kinase-inactivating knock-in mice, Pyk2-null mice, pharmacological inhibitors, Western blotting of tyrosine phosphorylation during capacitation, in vitro fertilization assay\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knock-in model definitively attributed function, compared with Pyk2 null to rule out related kinase, functional fertilization assay\",\n      \"pmids\": [\"27226326\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The MAN2A1-FER fusion protein localizes to the Golgi (via MAN2A1 signal peptide), has ~4-fold higher tyrosine kinase activity than wild-type FER, and phosphorylates EGFR at Tyr-88; expression activates BRAF, MEK, and AKT signaling and promotes proliferation, invasion, and tumor growth in vivo.\",\n      \"method\": \"RT-PCR in tumor samples, tagged fusion protein expression, Golgi fractionation, in vitro kinase assay, EGFR pY88 detection, xenograft tumor model, knockout in HUH7 cells\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro kinase assay with site-specific substrate, subcellular localization, genetic KO, and in vivo tumor model\",\n      \"pmids\": [\"28245430\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Fer and FerT associate with the mitochondrial electron transport chain in cancer cells; a Fer/FerT inhibitor (E260) disrupts mitochondrial function, induces energy-consuming autophagy, and causes FER to dissociate from PARP-1, leading to PARP-1 activation, energy crisis, and necrotic death selectively in malignant cells.\",\n      \"method\": \"Subcellular fractionation/mitochondrial localization, small-molecule inhibitor E260, co-immunoprecipitation (Fer–PARP-1), ATP assay, mitochondrial morphology imaging, xenograft tumor model\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mitochondrial localization by fractionation, co-IP of Fer–PARP-1, functional metabolic readouts, in vivo validation, single lab\",\n      \"pmids\": [\"29038547\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"FER tyrosine kinase phosphorylates CRMP2 at Tyr-479 and Tyr-499; crystal structures of wild-type and phosphomimetic CRMP2-Y479E show that phosphorylation prevents CRMP2 tetramerization, reducing microtubule bundling activity. FER depletion or sub-therapeutic inhibitor doses increase paclitaxel-induced microtubule stability and cytotoxicity in ovarian cancer cells and in vivo.\",\n      \"method\": \"In vitro phosphorylation assay, X-ray crystallography of CRMP2 and CRMP2-Y479E, microtubule bundling assay, siRNA knockdown, xenograft model\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structures of WT and phosphomimetic CRMP2, direct phosphorylation assay, microtubule functional assay, and in vivo validation\",\n      \"pmids\": [\"29396402\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"YY1 directly binds the FER promoter region to suppress FER transcription; reduced FER downstream leads to decreased formation of the STAT3–MMP2 complex, lower MMP2 expression, and inhibition of pancreatic cancer migration and invasion.\",\n      \"method\": \"Luciferase reporter, EMSA, ChIP assay, FER knockdown epistasis, in vivo invasion assay\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct promoter binding confirmed by three complementary methods, epistasis with FER knockdown establishing pathway order\",\n      \"pmids\": [\"31404611\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"FER phosphorylates PKCδ at Tyr-374; phospho-Y374-PKCδ prevents RAB5 release from late endosomes, blocking RAB5→RAB7 switching, thereby inhibiting EGFR lysosomal degradation and promoting EGFR recycling to the cell surface. PTPN14 phosphatase reverses this by dephosphorylating pY374-PKCδ.\",\n      \"method\": \"In vitro FER kinase assay (PKCδ Y374), phospho-specific antibodies, endosome fractionation, RAB5/RAB7 immunofluorescence, PTPN14 dephosphorylation assay, TNBC patient tissue analysis\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — direct substrate phosphorylation at defined site, mechanistic RAB switch demonstrated, counteracting phosphatase identified, clinical tissue correlation\",\n      \"pmids\": [\"33411917\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"FER engages its kinase domain to associate with the PH and PTB domains of IRS4 and phosphorylates IRS4 at Tyr-779; this phosphorylation recruits PIK3R2/p85β and activates the PI3K-AKT pathway, promoting ovarian cancer cell proliferation in vitro and in vivo.\",\n      \"method\": \"Mass spectrometry substrate identification, co-immunoprecipitation (kinase domain–IRS4 PH/PTB), in vitro phosphorylation assay, proximity-based tagging (BioID), phosphorylation-defective mutant rescue, xenograft tumor model\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — substrate identified by MS, direct binding domain mapped, phospho-site specific mutagenesis rescue, in vivo validation\",\n      \"pmids\": [\"35550247\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"FER (p94fer) and FerT (p51ferT) phosphorylate the TATA element modulatory factor (TMF) on its carboxy-terminal region in vitro and in vivo; TMF was identified as a FER substrate by yeast two-hybrid screening.\",\n      \"method\": \"Yeast two-hybrid screen, in vitro kinase assay, in vivo kinase assay, deletion mapping of TMF carboxy-terminus\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid plus in vitro and in vivo kinase assays, domain mapping, single lab\",\n      \"pmids\": [\"9742951\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Downregulation of Fer by RNAi arrests prostate and breast carcinoma cells at G0/G1. At the molecular level, Fer associates with the pRB phosphatase PP1α (via two PP1-binding motifs in its kinase domain), and Fer levels bidirectionally modulate PP1α activity, controlling pRB phosphorylation state and cell-cycle progression.\",\n      \"method\": \"RNAi knockdown, co-immunoprecipitation (Fer–PP1α), PP1α enzymatic activity assay, pRB phosphorylation Western blotting, flow cytometry cell-cycle analysis\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP, enzyme activity assay, bidirectional manipulation, multiple cancer cell lines, single lab\",\n      \"pmids\": [\"16732323\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Fer kinase regulates AR tyrosine phosphorylation at Tyr-223 via its SH2 domain interaction with AR, downstream of IL-6/STAT3 signaling, to drive androgen receptor (AR) transcriptional activation and PSA expression in prostate cancer cells.\",\n      \"method\": \"Co-immunoprecipitation (Fer–AR via SH2 domain), phospho-AR Tyr-223 detection, Fer siRNA/overexpression, PSA reporter assay, immunofluorescence co-localization in CRPC tissue\",\n      \"journal\": \"Molecular and cellular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct Fer–AR interaction mapped to SH2 domain, phospho-site identification, functional transcriptional readout, single lab\",\n      \"pmids\": [\"23906537\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"c-Src directly activates Fer by initiating its autophosphorylation, which is further amplified by Fer oligomerization; activated Fer phosphorylates ezrin at focal adhesion membranes, inducing cell transformation. The Src→Fer→ezrin axis is required for tumorigenesis and invasiveness in c-Src-upregulated cancer cells.\",\n      \"method\": \"Co-immunoprecipitation (c-Src–Fer at focal adhesion membranes), in vitro kinase assay (Fer phosphorylation of ezrin), Fer knockdown/overexpression, transformation assay, invasion assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct kinase cascade demonstrated, novel substrate (ezrin) identified, functional transformation readout, single lab\",\n      \"pmids\": [\"25867068\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Fer associates with insulin signaling complexes in adipocytes: insulin stimulates association of Fer with IRS-1–PI3-kinase complexes and activates PI3-kinase activity in anti-Fer immunoprecipitates, without stimulating Fer tyrosine phosphorylation; PDGF stimulates Fer recruitment to PDGFR–p85 PI3K complexes with Fer phosphorylation.\",\n      \"method\": \"Co-immunoprecipitation from 3T3-L1 adipocytes, PI3K enzymatic activity assay in Fer immunoprecipitates, insulin and PDGF stimulation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — PI3K activity measured in Fer precipitates, distinct phosphorylation responses to two ligands, single lab\",\n      \"pmids\": [\"11006284\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"FER is a cytoplasmic non-receptor tyrosine kinase that oligomerizes via N-terminal coiled-coil domains, is activated downstream of growth factor receptors (EGFR, PDGFR), cytokine receptors (IL-6/gp130), integrins, and immune receptors (FcεRI/Kit) in a Lyn/Fyn/Src-dependent manner, and phosphorylates a defined set of substrates — including cortactin (promoting actin polymerization and cell migration), β-catenin Tyr-142 (disrupting α-catenin association), PTP1B Tyr-152 (maintaining cadherin complex integrity), PECAM-1 ITIMs, CRMP2 Tyr-479/Tyr-499 (preventing microtubule bundling), MET Tyr-1349 (activating RAC1-PAK1-GAB1-SHP2-ERK), IRS4 Tyr-779 (recruiting PI3K-AKT), Vav2 Tyr-172 (stimulating Rac GEF activity), PKCδ Tyr-374 (blocking late endosome maturation and EGFR degradation), STAT3 (via SH2-domain interaction), and AR Tyr-223 — thereby regulating adherens junction stability, cell motility, invasion, metastasis, synaptic development, sperm capacitation, and innate immune cell recruitment.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"FER is a cytoplasmic non-receptor tyrosine kinase that integrates signals from growth factor, cytokine, integrin, and immune receptors to control cell adhesion, actin-based motility, and cell-cycle progression [#0, #21, #25]. Its kinase activity depends on a conserved catalytic aspartate (D743) [#5], and full activation is potentiated by N-terminal coiled-coil-driven trimerization that enables autophosphorylation in trans [#4]; c-Src and Fyn initiate FER activation, and the testis-specific FerT isoform lacks the N-terminal oligomerization capacity [#4, #6, #42]. A recurring functional module is FER's regulation of cadherin-based adherens junctions: FER constitutively binds p120 catenin and is thereby recruited to cadherin complexes, where it phosphorylates β-catenin at Tyr-142 to disrupt α-catenin association, and phosphorylates PTP1B at Tyr-152 to maintain β-catenin dephosphorylation and junction integrity [#0, #14, #17]. In the actin cytoskeleton, FER directly binds cortactin through its SH2 domain and phosphorylates it downstream of growth factors, osmotic stress, ROS-coupled integrin engagement, and phosphatidic acid binding to its FX domain, driving lamellipodia formation, N-cadherin immobilization, and cell migration [#1, #6, #18, #19, #24]; cortactin is a genetically validated in vivo FER substrate [#10]. FER additionally phosphorylates a defined substrate set that links it to distinct pathways — Vav2 Tyr-172 (Rac-GEF activation and metastasis) [#28], MET Tyr-1349 (RAC1/PAK1 and SHP2-ERK signaling) [#31], IRS4 Tyr-779 (PI3K-AKT activation) [#38], PKCδ Tyr-374 (blocking late-endosome maturation and EGFR degradation) [#37], CRMP2 Tyr-479/499 (preventing microtubule bundling) [#35], LRP6 (negatively regulating Wnt/β-catenin) [#30], and PECAM-1 ITIMs in mast cells downstream of FcεRI/Lyn [#20]. FER also acts kinase-independently as a STAT3 adaptor via its SH2 domain in IL-6/gp130 and PDGFRβ signaling [#25, #29], and it controls synapse formation through a p120ctn→FER→SHP-2→β-catenin presynaptic pathway [#23]. Genetic knock-in of catalytically dead FER establishes its requirement for sperm capacitation-associated tyrosine phosphorylation and fertilization [#32], and oncogenic activation occurs through a Golgi-localized MAN2A1-FER fusion with elevated kinase activity [#33].\",\n  \"teleology\": [\n    {\n      \"year\": 1991,\n      \"claim\": \"Established the basic subcellular distribution of FER protein, the first step toward placing it in a cellular compartment.\",\n      \"evidence\": \"Subcellular fractionation and immunofluorescence\",\n      \"pmids\": [\"1990274\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Nuclear/chromatin association was later contradicted by live-cell imaging\", \"No functional consequence of localization established\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Identified the constitutive p120 catenin interaction and growth-factor-coupled activation, defining FER as a receptor-linked kinase that docks at the catenin complex.\",\n      \"evidence\": \"Co-IP and oligomerization assays with EGF/PDGF stimulation in A431 cells and fibroblasts\",\n      \"pmids\": [\"7623846\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify catalytic substrates\", \"Mechanism of growth-factor-induced activation unresolved\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Defined cortactin as a direct SH2-domain-bound substrate and TMF as a further substrate, linking FER catalytic activity to actin regulation.\",\n      \"evidence\": \"SH2-domain binding mapping, dominant-negative mutant, kinase assays, and yeast two-hybrid (TMF)\",\n      \"pmids\": [\"9722593\", \"9742951\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Site of cortactin phosphorylation not yet mapped\", \"Physiological context of TMF phosphorylation unclear\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Showed that FER overexpression disrupts adherens junctions, connecting FER activity to loss of cell-cell adhesion and detachment.\",\n      \"evidence\": \"Tetracycline-regulatable overexpression with co-IP and phosphotyrosine blotting in fibroblasts\",\n      \"pmids\": [\"9742093\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not pinpoint which phosphorylation event drives junction dissolution\", \"Overexpression may exceed physiological levels\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Resolved how FER achieves activation, defining coiled-coil-driven trimerization that potentiates trans-autophosphorylation and a catalytic aspartate essential for activity.\",\n      \"evidence\": \"Gel filtration, deletion-mutant kinase assays, and active-site mutagenesis with structural modeling\",\n      \"pmids\": [\"10391941\", \"10195287\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Oligomerization shown not strictly required for activation\", \"Upstream trigger of oligomerization in cells not defined\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Placed FER downstream of Src-family kinases (Fyn) and defined the STAT3 adaptor function, distinguishing N-terminal-dependent activities from the shared kinase domain.\",\n      \"evidence\": \"Fyn/Src-deficient MEFs, cortactin site mutagenesis, chimeric N-terminal swaps, and N-cadherin/integrin peptide competition\",\n      \"pmids\": [\"10921917\", \"10878010\", \"10998246\", \"10851023\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"STAT3 activation mechanism via N-terminus not fully resolved\", \"Cadherin-integrin crosstalk shown only by peptide competition\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Genetic knock-in of kinase-dead Fer(D743R) established cortactin as a specific in vivo substrate and showed FER is dispensable for viability and fertility, while live imaging revised its localization to cytoplasmic.\",\n      \"evidence\": \"Fer(D743R) knock-in mice, phospho-substrate blotting, and GFP-Fer confocal imaging\",\n      \"pmids\": [\"11134346\", \"11339827\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"β-catenin and p120ctn phosphorylation found unaffected in vivo, leaving their physiological FER-dependence open\", \"Functional redundancy with Fps/Fes not excluded\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Extended FER into immune signaling and revealed negative regulation, placing it downstream of FcεRI for sustained p38 and showing plectin restrains its activity.\",\n      \"evidence\": \"Knock-in mast cells with migration/degranulation assays and plectin-null fibroblast kinase assays\",\n      \"pmids\": [\"12192036\", \"12200133\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of plectin-mediated inhibition unclear\", \"How FER selectively sustains p38 not defined\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Defined site-specific substrates at junctions and microtubules — β-catenin Tyr-142 and PECAM-1 ITIM/Tyr-700 — and the p120ctn docking that couples FER to Yes and oncogenic K-ras.\",\n      \"evidence\": \"In vitro kinase assays, K-ras transfectants, expression cloning, GFP-Fer live imaging, and testis co-IP panels\",\n      \"pmids\": [\"12640114\", \"12972546\", \"12700184\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo relevance of β-catenin Tyr-142 phosphorylation not established in physiological settings\", \"PECAM-1 phosphorylation consequences for downstream signaling incompletely mapped\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Mechanistically linked FER to cadherin complex stability via PTP1B Tyr-152 and to actin dynamics, showing actin depolymerization promotes FER-cortactin association.\",\n      \"evidence\": \"Domain mapping, peptide competition, phospho-mutant rescue in fer(D743R) MEFs, and latrunculin B treatment with cortactin deletion mapping\",\n      \"pmids\": [\"15226396\", \"15030313\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cortactin C-terminal phosphorylation functional output not fully resolved here\", \"Coupling of actin state to FER recruitment mechanism unclear\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Demonstrated that FER-mediated cortactin phosphorylation functionally strengthens intercellular adhesion by immobilizing N-cadherin at nascent contacts.\",\n      \"evidence\": \"FRAP, shear adhesion assays, and N-cadherin bead pulldowns in fer(D743R) MEFs\",\n      \"pmids\": [\"16176974\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative link between cortactin phospho-level and adhesion strength not fully dissected\", \"Relationship to FER's junction-disrupting overexpression phenotype unreconciled\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Placed FER in the Lyn→FER→PECAM-1 immune axis and revealed a cell-cycle role through PP1α regulation of pRB phosphorylation.\",\n      \"evidence\": \"Lyn-null and fer/fps-null mast cells; RNAi with PP1α activity and pRB phosphorylation assays in carcinoma cells\",\n      \"pmids\": [\"16731527\", \"16732323\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"FER-PP1α interaction shown in single lab without genetic validation\", \"Whether PP1α regulation is kinase-dependent unclear\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Coupled FER to integrin/ROS-driven migration and to Semaphorin-mediated axon retraction, identifying CRMP2 and tubulin as neuronal substrates.\",\n      \"evidence\": \"Fibronectin/H2O2 stimulation in fer(DR/DR) MEFs; Sema3A retraction in fer-mutant DRG neurons with in vitro kinase assays\",\n      \"pmids\": [\"17606629\", \"18053124\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"CRMP2 phosphorylation sites not yet defined at this stage\", \"How ROS activates FER mechanistically unresolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Established a presynaptic p120ctn→FER→SHP-2→β-catenin pathway required for excitatory synapse formation, defining FER's role in neuronal development.\",\n      \"evidence\": \"Fer shRNA in hippocampal neurons with epistasis rescue and electrophysiology\",\n      \"pmids\": [\"19047464\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct FER substrate within this pathway not identified\", \"Relationship to FER kinase activity vs adaptor role unclear\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identified a lipid-sensing FX domain that targets FER to phosphatidic acid and the IL-6/gp130 route to STAT3, broadening activation inputs.\",\n      \"evidence\": \"Lipid-binding assays with FX-domain mutants and migration assays; IL-6-induced Fer/gp130/STAT3 co-IP with bidirectional manipulation\",\n      \"pmids\": [\"19738202\", \"19147545\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"FX-PA interaction structurally uncharacterized\", \"STAT3 activation kinase-dependence not resolved here\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined NRP1 as a direct FER partner transducing Sema3A-induced neuronal death and axon retraction with in vivo ischemia relevance.\",\n      \"evidence\": \"NRP1-Fer co-IP, Fer siRNA in cortical neurons, and a mouse cerebral ischemia model\",\n      \"pmids\": [\"20133938\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab co-IP without reciprocal structural validation\", \"FER substrate downstream of NRP1 not identified\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Linked FER overexpression to EGFR-driven NF-κB activation and chemoresistance, connecting FER to receptor-proximal oncogenic signaling.\",\n      \"evidence\": \"Insertional mutagenesis screen, FER-EGFR co-IP, siRNA, and drug-resistance readouts\",\n      \"pmids\": [\"21518868\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"FER-EGFR interaction shown only by overexpression co-IP\", \"Whether NF-κB activation requires FER kinase activity unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Established FER as a metastasis driver via Vav2 Tyr-172/Rac, as a kinase-independent PDGFRβ-STAT3 adaptor, and as an AR regulator, distinguishing scaffolding from catalytic functions.\",\n      \"evidence\": \"shRNA knockdown with Vav2 phospho-assay, Rac-GTP pulldown, metastasis models; PDGFRβ autophosphorylation-site mapping; Fer-AR SH2 interaction with PSA reporter\",\n      \"pmids\": [\"23699534\", \"23589302\", \"23906537\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of kinase-independent STAT3 activation incompletely resolved\", \"AR regulation shown in single lab\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed FER (with Src) directly phosphorylates LRP6 to negatively regulate Wnt/β-catenin signaling, adding a developmental signaling axis with CK1γ counter-regulation.\",\n      \"evidence\": \"Direct in vitro phosphorylation, fer/src-null MEF Wnt reporters, and epistasis analysis\",\n      \"pmids\": [\"25391905\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"LRP6 phospho-site consequences for Wnt receptor function partly inferred\", \"Tissue context of FER-LRP6 regulation undefined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Reconstructed a Src→FER→ezrin activation cascade at focal adhesions required for transformation, mechanistically connecting FER activation to invasiveness.\",\n      \"evidence\": \"c-Src-Fer co-IP at focal adhesions, in vitro ezrin phosphorylation, and transformation/invasion assays\",\n      \"pmids\": [\"25867068\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab demonstration of the Src-FER-ezrin axis\", \"Ezrin phospho-site not defined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified MET Tyr-1349 as a FER substrate driving RAC1/SHP2-ERK metastasis and established FER's requirement for sperm capacitation-associated phosphorylation and fertilization.\",\n      \"evidence\": \"FER-MET co-IP and site-specific phosphorylation with metastasis models; Fer kinase-dead and Pyk2-null mice with IVF assays\",\n      \"pmids\": [\"27401557\", \"27226326\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism distinguishing FER's MET scaffolding from kinase function partly inferred\", \"Capacitation substrates of FER in sperm not enumerated\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined oncogenic activation through a Golgi-localized MAN2A1-FER fusion with elevated kinase activity, and revealed FER/FerT mitochondrial association coupled to PARP-1 in cancer metabolism.\",\n      \"evidence\": \"Fusion-protein expression with Golgi fractionation and EGFR pY88 assay; mitochondrial fractionation, E260 inhibitor, and Fer-PARP-1 co-IP\",\n      \"pmids\": [\"28245430\", \"29038547\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"FER-PARP-1 mitochondrial mechanism from single lab\", \"Structural basis of fusion-driven hyperactivity undefined\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Resolved at atomic resolution how FER phosphorylation of CRMP2 Tyr-479/499 blocks tetramerization and microtubule bundling, providing a structural mechanism with chemotherapy-sensitization relevance.\",\n      \"evidence\": \"In vitro phosphorylation, X-ray crystallography of CRMP2 and phosphomimetic, microtubule bundling assays, and xenografts\",\n      \"pmids\": [\"29396402\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo stoichiometry of CRMP2 phosphorylation not quantified\", \"Generality across CRMP family unaddressed\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified YY1 as a direct transcriptional repressor of FER, placing FER within a STAT3-MMP2 invasion axis in pancreatic cancer.\",\n      \"evidence\": \"Luciferase, EMSA, ChIP, and FER-knockdown epistasis with invasion assays\",\n      \"pmids\": [\"31404611\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab transcriptional regulation\", \"Whether FER-STAT3-MMP2 link requires kinase activity unclear\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined FER phosphorylation of PKCδ Tyr-374 as a switch blocking RAB5→RAB7 conversion to inhibit EGFR lysosomal degradation, with PTPN14 as the counteracting phosphatase.\",\n      \"evidence\": \"In vitro kinase assay, endosome fractionation, RAB5/RAB7 imaging, PTPN14 dephosphorylation, and TNBC tissue analysis\",\n      \"pmids\": [\"33411917\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How phospho-PKCδ mechanistically retains RAB5 not fully resolved\", \"In vivo relevance of the EGFR-recycling phenotype limited to tissue correlation\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Established IRS4 Tyr-779 as a FER substrate recruiting PI3K/p85β to drive AKT signaling and ovarian cancer proliferation, mapping the kinase-domain–IRS4 interaction.\",\n      \"evidence\": \"Mass spectrometry, BioID, kinase-domain–IRS4 co-IP, phospho-mutant rescue, and xenografts\",\n      \"pmids\": [\"35550247\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Selectivity of FER for IRS4 over other IRS proteins not fully addressed\", \"Upstream receptor coupling to FER-IRS4 in ovarian cancer undefined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How FER integrates its many context-specific inputs and substrate choices into coherent signaling decisions, and the structural basis for its scaffolding versus catalytic functions, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No full-length structural model integrating F-BAR/FX, coiled-coil, SH2, and kinase domains\", \"Substrate-selection logic across tissues unexplained\", \"Mechanism switching FER between kinase and adaptor modes undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [1, 6, 14, 17, 28, 31, 35, 37, 38]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [5, 6, 14, 31, 35, 37, 38]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 21, 25, 27]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [25, 29]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [1, 18, 19]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [24]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [2, 11]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [15, 16, 22]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [7, 16, 37]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [37]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [34]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [33]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 25, 29, 31, 38]},\n      {\"term_id\": \"R-HSA-1474244\", \"supporting_discovery_ids\": [0, 3, 14, 17, 19]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [12, 20]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [40]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [22, 23, 26]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [28, 31, 33, 38]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [37]}\n    ],\n    \"complexes\": [\n      \"cadherin/catenin adherens junction complex\",\n      \"PDGFRβ–p85 PI3K complex\",\n      \"gp130–STAT3 complex\"\n    ],\n    \"partners\": [\n      \"CTNND1\",\n      \"CTTN\",\n      \"STAT3\",\n      \"FYN\",\n      \"SRC\",\n      \"MET\",\n      \"EGFR\",\n      \"IRS4\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}