{"gene":"FMNL2","run_date":"2026-04-28T17:46:04","timeline":{"discoveries":[{"year":2012,"finding":"FMNL2 is cotranslationally modified by N-terminal myristoylation, which together with interaction with active Cdc42, is required for proper subcellular targeting to lamellipodia and filopodia tips. Abolition of myristoylation or Cdc42 binding prevents FMNL2 activation and membrane targeting.","method":"Site-directed mutagenesis (Gly2→Ala to block myristoylation, Cdc42-binding mutants), immunofluorescence, RNAi knockdown","journal":"Current Biology","confidence":"High","confidence_rationale":"Tier 1-2 — mutagenesis + in vitro biochemical assays + live-cell localization, replicated across multiple orthogonal methods in one study","pmids":["22608513"],"is_preprint":false},{"year":2012,"finding":"FMNL2 acts as an actin filament elongation factor (not nucleator) in the presence of profilin in vitro, and can capture and elongate filament ends generated by Arp2/3-mediated branching. RNAi-mediated silencing decreases lamellipodia protrusion rate and cell migration efficiency.","method":"In vitro actin polymerization/TIRF assays with purified proteins, RNAi knockdown with quantitative lamellipodium protrusion and migration assays","journal":"Current Biology","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution assay with purified proteins plus functional RNAi validation, multiple orthogonal methods","pmids":["22608513"],"is_preprint":false},{"year":2015,"finding":"Crystal structures of the N-terminal domains of human FMNL1 and FMNL2 in complex with active Cdc42 reveal that Cdc42 contacts all five armadillo repeats of the formin, with specific interactions formed by the Rho-GTPase insert helix. Mutation of three residues in Rac1 confers gain-of-function FMNL2 binding and reconstitutes the Cdc42 phenotype in vivo. FMNL dimerization via a parallel coiled coil creates an umbrella-shaped structure spanning >15 nm with six membrane interaction motifs.","method":"X-ray crystallography, site-directed mutagenesis of Rac1/Cdc42 switch residues, in vivo functional rescue assays","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 1 — crystal structure plus mutagenesis with in vivo validation","pmids":["25963737"],"is_preprint":false},{"year":2012,"finding":"N-myristoylation at Gly2 of FMNL2 is required for plasma membrane association and for the induction of cellular morphological changes; replacement of Gly2 with Ala or pharmacological inhibition of N-myristoyltransferase abolishes membrane localization and morphological effects.","method":"Site-directed mutagenesis (Gly2→Ala), N-myristoylation inhibitor treatment, immunofluorescence in HEK293T cells","journal":"Bioscience, Biotechnology, and Biochemistry","confidence":"High","confidence_rationale":"Tier 1-2 — mutagenesis plus chemical inhibition, orthogonal approaches confirming same conclusion","pmids":["22790947"],"is_preprint":false},{"year":2017,"finding":"FMNL2 and FMNL3 accumulate at the Golgi apparatus in a manner requiring both N-terminal myristoylation and interaction with Cdc42. At the Golgi, they assemble a perinuclear actin meshwork; their depletion by RNAi or CRISPR/Cas9 causes Golgi fragmentation, enlargement of endosomes, defective maturation into late endosomes/lysosomes, and impaired anterograde trafficking of VSV-G to the plasma membrane.","method":"RNAi, CRISPR/Cas9 knockout, live-cell imaging of VSV-G trafficking, immunofluorescence, myristoylation and Cdc42-binding mutants","journal":"Scientific Reports","confidence":"High","confidence_rationale":"Tier 2 — RNAi and CRISPR KO with multiple defined phenotypic readouts plus mutagenesis, multiple orthogonal methods","pmids":["28852060"],"is_preprint":false},{"year":2010,"finding":"FMNL2 knockdown in colorectal carcinoma cells induces an epithelial-state transition (cobblestone morphology, upregulation of E-cadherin/α-catenin/γ-catenin, downregulation of vimentin/snail/slug) and abolishes TGF-β-induced invasion and EMT. FMNL2 promotes EMT via TGF-β/Smad3 effectors and in collaboration with MAPK/MEK pathway; MEK inhibitor U0126 abrogates elevated p-MAPK/p-MEK in FMNL2-overexpressing cells.","method":"shRNA knockdown, overexpression, morphological analysis, Western blotting for EMT markers, kinase inhibitor treatment (U0126, LY294002), TGF-β stimulation assays","journal":"Molecular Cancer Research","confidence":"Medium","confidence_rationale":"Tier 2 — clean KD/OE with defined cellular phenotype and pathway inhibitor validation, single lab","pmids":["21071512"],"is_preprint":false},{"year":2017,"finding":"FMNL2 physically interacts with COMMD10 (by Co-IP and GST pull-down) and promotes its ubiquitin-mediated proteasomal degradation. Loss of COMMD10 releases p65 NF-κB from inhibition, allowing nuclear translocation of p65 and activation of the NF-κB pathway to promote CRC invasion and metastasis.","method":"Co-immunoprecipitation, GST pull-down, in vitro ubiquitination assay, dual-luciferase NF-κB reporter, nuclear fractionation, Western blotting, animal metastasis models","journal":"British Journal of Cancer","confidence":"High","confidence_rationale":"Tier 1-2 — direct protein interaction confirmed by Co-IP and GST pull-down plus in vitro ubiquitination assay plus functional pathway reporters","pmids":["28817833"],"is_preprint":false},{"year":2018,"finding":"Cortactin directly binds FMNL2 and cooperatively enhances actin polymerization and recycling endosome motility. This cortactin–FMNL2 interaction is required for invadopodia formation and matrix degradation in colorectal cancer cells; EGF/Cdc42 stimulation further enhances the cortactin–FMNL2 complex to increase invadopodia number and matrix degradation.","method":"Co-immunoprecipitation, GST pull-down, actin polymerization assays, live-cell imaging of endosome motility, invadopodia formation assays, gelatin matrix degradation assay, in vivo metastasis model","journal":"Cancer Letters","confidence":"High","confidence_rationale":"Tier 1-2 — direct binding confirmed by reciprocal Co-IP and GST pull-down plus multiple functional readouts","pmids":["29374558"],"is_preprint":false},{"year":2020,"finding":"FMNL2 directly binds dephosphorylated fascin within filopodia and controls fascin dynamics (phosphorylation state, F-actin binding, localization) at the nanoscale in both 2D and 3D environments, as shown by a fascin FRET biosensor and advanced live-cell imaging.","method":"FRET-based fascin biosensor, structured illumination microscopy, TIRF-SIM, co-immunoprecipitation, RNAi knockdown, live-cell imaging","journal":"Journal of Cell Biology","confidence":"High","confidence_rationale":"Tier 1-2 — direct binding by Co-IP plus quantitative live-cell biosensor imaging with multiple orthogonal microscopy methods","pmids":["32294157"],"is_preprint":false},{"year":2021,"finding":"Induced depletion of Arp2/3 complex (Actr3 knockout) reproducibly increases FMNL2 and FMNL3 formin expression, which correlates with explosive induction of filopodia formation, revealing a compensatory or co-regulatory relationship between branched (Arp2/3) and unbranched (FMNL2/3) actin networks.","method":"Conditional CRISPR/Cas9 Actr3 knockout (tamoxifen-inducible), immunoblotting, live-cell imaging, quantitative filopodia analysis","journal":"Frontiers in Cell and Developmental Biology","confidence":"Medium","confidence_rationale":"Tier 2 — clean conditional KO with defined molecular and cellular phenotype, single lab","pmids":["33598464"],"is_preprint":false},{"year":2018,"finding":"FMNL2 mediates cell-cell contact formation downstream of Rac1, independently of Cdc42. CRISPR/Cas9 loss of FMNL2 in MCF10A cells impairs intercellular contact establishment; optogenetic Rac1 activation recruits FMNL2 to newly forming junctions, whereas Cdc42 silencing does not affect FMNL2-mediated contact formation.","method":"CRISPR/Cas9 knockout, optogenetic Rac1 activation, live-cell imaging of junction formation, RNAi, quantitative protrusion analysis","journal":"PLoS ONE","confidence":"High","confidence_rationale":"Tier 2 — CRISPR KO plus optogenetics provides clean mechanistic epistasis, replicated with multiple approaches in one study","pmids":["29579104"],"is_preprint":false},{"year":2023,"finding":"FMNL2-dependent rapid filopodia formation requires both N-terminal myristoylation (for filopodia tip localization) and serine 1072 phosphorylation within the DAD domain by PKCα. PKCα localizes to the base of growing filopodia and a PKCα-FMNL2 signaling module spatiotemporally controls filopodia dynamics.","method":"Structured illumination microscopy, phospho-site mutagenesis (S1072A), PKCα inhibition/knockdown, live-cell imaging, immunofluorescence co-localization","journal":"Biomolecules","confidence":"Medium","confidence_rationale":"Tier 1-2 — mutagenesis of phospho-site plus chemical and genetic inhibition of PKCα, single lab","pmids":["36979484"],"is_preprint":false},{"year":2021,"finding":"A disease-associated heterozygous FMNL2 p.L136P mutation causes subcellular mislocalization, deregulated autoinhibition (gain-of-function), impaired cell spreading, defective filopodia formation in fibroblasts, and dysregulated podosome formation with defective matrix degradation in THP-1 macrophages.","method":"Expression of L136P mutant vs. wild-type in patient-derived and model cell lines, immunofluorescence localization, cell spreading assay, filopodia quantification, podosome formation, gelatin degradation assay","journal":"PLoS ONE","confidence":"Medium","confidence_rationale":"Tier 2 — functional characterization of disease mutation with multiple cellular phenotype readouts, single lab","pmids":["34043722"],"is_preprint":false},{"year":2022,"finding":"FMNL2 cooperates with the I-BAR domain protein IRTKS (but not IRSp53) to drive filopodia assembly. FMNL2 and IRTKS are mutually dependent cofactors; the primary function of FMNL2 in this process is membrane binding to recruit IRTKS, which then nucleates filopodia assembly, while FH2-mediated actin dynamics is secondary.","method":"Co-immunoprecipitation, co-expression studies, filopodia quantification, RNAi knockdown of IRTKS/IRSp53, domain mutagenesis","journal":"Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2-3 — direct binding by Co-IP plus functional epistasis via RNAi, single lab with multiple orthogonal approaches","pmids":["36259517"],"is_preprint":false},{"year":2024,"finding":"FMNL2 localizes to the oocyte cortex and spindle periphery during meiosis; its depletion reduces cytoplasmic actin polymerization, causes failure of meiotic spindle migration to the cortex, leading to polar body extrusion defects and large polar bodies. FMNL2 also associates with mitochondria and ER-related proteins (by mass spectrometry), and its depletion disrupts mitochondrial membrane potential and causes ER stress.","method":"Morpholino/siRNA knockdown in mouse and porcine oocytes, live-cell imaging, immunofluorescence, mass spectrometry proteomics, mRNA rescue microinjection, JC-1 mitochondrial membrane potential assay","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1-2 — loss-of-function in two species with rescue experiment, live imaging, and proteomics, multiple orthogonal methods","pmids":["38747713"],"is_preprint":false},{"year":2024,"finding":"Proximity labeling proteomics (BioID) identified an FMNL2 interactome including known partners and novel interactors related to filopodia, lamellipodia, vesicle trafficking, cell junctions, focal adhesions, and extracellular vesicles; FMNL2 protein was directly detected in exosomes.","method":"BioID proximity labeling, quantitative mass spectrometry proteomics, exosome isolation and Western blotting","journal":"International Journal of Molecular Sciences","confidence":"Medium","confidence_rationale":"Tier 2 — systematic proximity proteomics with direct exosome validation, single lab","pmids":["38891874"],"is_preprint":false},{"year":2025,"finding":"FMNL2 directly interacts with SRC kinase through the FMNL2-FH1 domain and SRC-SH3 domain, and this interaction promotes androgen receptor (AR) translocation from cytoplasm to nucleus, increasing AR target gene expression and driving enzalutamide resistance in prostate cancer cells.","method":"Co-immunoprecipitation, domain mapping, nuclear fractionation, AR reporter assays, RNAi knockdown, SRC inhibitor (dasatinib) treatment, proliferation assays","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2-3 — direct interaction confirmed by Co-IP with domain mapping plus functional pathway validation, single lab","pmids":["40212590"],"is_preprint":false},{"year":2020,"finding":"CAV1 (Caveolin-1) modulates collective epithelial cell migration by controlling cortical availability of FMNL2; CAV1 depletion increases cortical recruitment of FMNL2, and simultaneous depletion of FMNL2 rescues the migration defect caused by CAV1 RNAi, placing FMNL2 downstream of CAV1 in collective migration.","method":"RNAi (CAV1 and FMNL2 single and double knockdown), collective migration velocity correlation analysis, immunofluorescence","journal":"Biology of the Cell","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis by double knockdown with quantitative migration phenotype, single lab","pmids":["33169848"],"is_preprint":false},{"year":2022,"finding":"FMNL2 suppresses breast cancer cell migration and invasion by inhibiting the RhoA/LIMK/Cofilin pathway, and this effect is mediated through reduction of cytoplasmic p27. ERα overexpression reduces FMNL2 protein levels via proteasomal degradation (blocked by MG132).","method":"RNAi knockdown, overexpression, Rho inhibitor (ZOL) and LIMK inhibitor (BMS3) treatment, Western blotting for RhoA/LIMK/Cofilin, cytoplasmic p27 manipulation, MG132 proteasome inhibition, in vivo xenograft","journal":"Cell Death Discovery","confidence":"Medium","confidence_rationale":"Tier 2 — KD/OE with pathway inhibitor validation and pathway placement, single lab","pmids":["35379791"],"is_preprint":false}],"current_model":"FMNL2 is a Diaphanous-related formin that is cotranslationally N-myristoylated at Gly2 and autoinhibited until activated by binding of active Cdc42 (or Rac1) to its N-terminal armadillo repeats, whereupon it targets to lamellipodia/filopodia tips and the Golgi apparatus to drive actin filament elongation (not nucleation) in the presence of profilin; at filopodia it cooperates with IRTKS and regulates fascin dynamics, its membrane targeting and filopodia formation are additionally controlled by PKCα-mediated phosphorylation of Ser1072 in the DAD domain, and it participates in Golgi-dependent anterograde trafficking, oocyte meiotic spindle migration, cell-cell junction formation downstream of Rac1, invadopodium formation via direct interaction with cortactin, and nuclear AR translocation via direct interaction with SRC kinase."},"narrative":{"teleology":[{"year":2010,"claim":"Establishing that FMNL2 promotes epithelial-to-mesenchymal transition and invasion in colorectal cancer cells linked it to the TGF-β/Smad3 and MAPK/MEK signaling cascades, providing the first functional context for the gene in cancer cell plasticity.","evidence":"shRNA knockdown and overexpression in CRC cells with EMT marker profiling and kinase inhibitor treatment","pmids":["21071512"],"confidence":"Medium","gaps":["Mechanism by which FMNL2 activates MAPK/MEK is indirect and unresolved","Single lab, no independent replication","No demonstration of direct formin-actin activity in this context"]},{"year":2012,"claim":"Defining FMNL2 as a profilin-dependent actin filament elongator (not nucleator) that requires cotranslational N-myristoylation and Cdc42 binding for membrane targeting established its core biochemical activity and activation mechanism.","evidence":"TIRF-based in vitro actin polymerization with purified proteins, site-directed mutagenesis (Gly2→Ala, Cdc42-binding mutants), RNAi with quantitative lamellipodium and migration assays in B16-F1 cells","pmids":["22608513","22790947"],"confidence":"High","gaps":["No structure of the autoinhibited full-length dimer","Profilin isoform specificity not determined","In vivo kinetics of elongation vs. Arp2/3 cooperation not measured"]},{"year":2015,"claim":"Crystal structures of FMNL2 N-terminal domains bound to Cdc42 revealed how all five armadillo repeats and the Rho-GTPase insert helix mediate specificity, and how an umbrella-shaped dimer with six membrane-interaction motifs couples GTPase sensing to membrane association.","evidence":"X-ray crystallography of FMNL1/FMNL2–Cdc42 complexes, mutagenesis of Rac1 to confer Cdc42-like binding with in vivo rescue","pmids":["25963737"],"confidence":"High","gaps":["No structure capturing the transition from autoinhibited to active state","Structural basis for Rac1 activation at junctions vs. Cdc42 activation at filopodia unresolved"]},{"year":2017,"claim":"Demonstrating that FMNL2 localizes to the Golgi in a myristoylation- and Cdc42-dependent manner and is required for Golgi integrity, endosome maturation, and anterograde trafficking expanded its role from a lamellipodia/filopodia factor to a central organizer of membrane traffic.","evidence":"RNAi and CRISPR/Cas9 KO with live-cell VSV-G trafficking, Golgi fragmentation, and endosome analysis","pmids":["28852060"],"confidence":"High","gaps":["Identity of actin structures assembled at the Golgi not fully resolved","Whether FMNL2 acts at the Golgi independently of FMNL3 is unclear"]},{"year":2017,"claim":"Identification of COMMD10 as a direct FMNL2 binding partner whose ubiquitin-mediated degradation by FMNL2 de-represses NF-κB/p65 signaling revealed a non-canonical signaling function beyond actin assembly.","evidence":"Co-IP, GST pull-down, in vitro ubiquitination assay, NF-κB reporter, nuclear fractionation, in vivo metastasis model","pmids":["28817833"],"confidence":"High","gaps":["Whether FMNL2 itself has E3 ligase activity or recruits an E3 ligase is not resolved","Relevance outside colorectal cancer not tested"]},{"year":2018,"claim":"Showing that cortactin directly binds FMNL2 and cooperatively enhances actin polymerization for invadopodia formation and recycling endosome motility linked the formin to matrix degradation-competent structures.","evidence":"Reciprocal Co-IP, GST pull-down, actin polymerization assays, invadopodia and gelatin degradation assays, live-cell endosome tracking","pmids":["29374558"],"confidence":"High","gaps":["Binding interface between cortactin and FMNL2 not mapped","Whether cortactin relieves autoinhibition or acts allosterically is unknown"]},{"year":2018,"claim":"Demonstrating that FMNL2 mediates Rac1-dependent cell–cell junction formation independently of Cdc42 established a second Rho-GTPase activation axis for the formin in a distinct cellular context.","evidence":"CRISPR/Cas9 KO in MCF10A cells, optogenetic Rac1 activation with live-cell junction imaging, Cdc42 RNAi epistasis","pmids":["29579104"],"confidence":"High","gaps":["How Rac1 structurally activates FMNL2 given the Cdc42-specific insert helix contacts is unknown","Downstream actin structures at nascent junctions not characterized"]},{"year":2020,"claim":"Live-cell FRET biosensor imaging revealed that FMNL2 directly binds dephosphorylated fascin in filopodia and controls fascin dynamics at nanoscale resolution, linking the formin to actin-bundling regulation.","evidence":"FRET-based fascin biosensor, SIM/TIRF-SIM, Co-IP, RNAi","pmids":["32294157"],"confidence":"High","gaps":["Whether FMNL2 directly modulates fascin phosphorylation or acts via kinase/phosphatase recruitment is unresolved","Binding interface between FMNL2 and fascin not mapped"]},{"year":2021,"claim":"Upregulation of FMNL2 upon Arp2/3 complex depletion, coinciding with explosive filopodia induction, revealed a compensatory relationship between branched and unbranched actin networks.","evidence":"Conditional CRISPR/Cas9 Actr3 KO, immunoblotting, quantitative filopodia analysis","pmids":["33598464"],"confidence":"Medium","gaps":["Transcriptional vs. post-translational mechanism of FMNL2 upregulation not determined","Single cell system (B16-F1)","Functional requirement of FMNL2 for the filopodia phenotype not directly tested by double KO"]},{"year":2022,"claim":"Showing that FMNL2 cooperates with the I-BAR protein IRTKS (not IRSp53) for filopodia assembly, with FMNL2's primary role being membrane recruitment of IRTKS rather than FH2-mediated actin elongation, reframed FMNL2 as a membrane-targeting scaffold in filopodia initiation.","evidence":"Co-IP, co-expression, filopodia quantification, RNAi of IRTKS/IRSp53, domain mutagenesis","pmids":["36259517"],"confidence":"Medium","gaps":["Single lab; IRTKS–FMNL2 interface not structurally resolved","Relative contributions of membrane binding vs. actin elongation not quantified in vivo"]},{"year":2023,"claim":"Identification of PKCα-mediated Ser1072 phosphorylation in the DAD domain as required for rapid filopodia formation uncovered a post-translational regulatory layer controlling FMNL2 activation kinetics.","evidence":"Phospho-site mutagenesis (S1072A), PKCα inhibition and knockdown, SIM live-cell imaging","pmids":["36979484"],"confidence":"Medium","gaps":["Whether S1072 phosphorylation relieves autoinhibition or promotes a distinct conformational change is untested","In vitro kinase assay for direct PKCα phosphorylation of S1072 not shown","Single lab"]},{"year":2024,"claim":"Demonstrating that FMNL2 drives cytoplasmic actin polymerization required for meiotic spindle migration to the oocyte cortex, with its depletion causing polar body extrusion defects and mitochondrial/ER stress, extended the formin's function to female gamete maturation.","evidence":"Morpholino/siRNA knockdown in mouse and porcine oocytes, mRNA rescue, live-cell imaging, mass spectrometry proteomics, JC-1 assay","pmids":["38747713"],"confidence":"High","gaps":["Whether FMNL2 directly organizes mitochondrial/ER membranes or the stress is secondary to actin disorganization is unclear","Upstream activating GTPase in oocytes not identified"]},{"year":2025,"claim":"Discovery that FMNL2 directly interacts with SRC kinase (FH1–SH3 domains) to promote androgen receptor nuclear translocation and enzalutamide resistance revealed a kinase-scaffolding function in hormone signaling.","evidence":"Co-IP with domain mapping, nuclear fractionation, AR reporter, dasatinib treatment, RNAi","pmids":["40212590"],"confidence":"Medium","gaps":["Whether the FMNL2–SRC interaction is actin-dependent or independent is not tested","Single cancer cell system (prostate)","No structural model of the FH1–SH3 interaction"]},{"year":null,"claim":"A full-length structure of autoinhibited and activated FMNL2 dimer, the mechanism by which FMNL2 promotes COMMD10 ubiquitination, whether PKCα directly phosphorylates S1072 in vitro, and how Rac1 achieves activation despite the Cdc42-specific structural contacts remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No full-length structure","E3 ligase identity for COMMD10 degradation unknown","Direct PKCα–FMNL2 kinase reaction not reconstituted","Rac1 activation mechanism structurally unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[1,8,13]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[13,16]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,3,11]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[4]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[1,8,14]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,14]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[4,15]}],"pathway":[{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[10]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[4,15]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[5,6,16]},{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[14]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[14]}],"complexes":[],"partners":["CDC42","RAC1","FSCN1","CTNND1","IRTKS","SRC","COMMD10","CTTN"],"other_free_text":[]},"mechanistic_narrative":"FMNL2 is a Diaphanous-related formin that drives actin-dependent membrane dynamics in cell migration, junction formation, intracellular trafficking, and meiotic spindle positioning. It is cotranslationally N-myristoylated at Gly2 and maintained in an autoinhibited state until activated by Cdc42 (or Rac1 at cell–cell junctions), whereupon it targets to lamellipodia/filopodia tips and the Golgi, functioning as a profilin-dependent actin filament elongation factor—not a nucleator—that captures and extends Arp2/3-generated barbed ends [PMID:22608513, PMID:25963737, PMID:28852060, PMID:29579104]. At filopodia, FMNL2 cooperates with the I-BAR protein IRTKS to initiate filopodia assembly and directly binds and regulates fascin dynamics, with PKCα-mediated phosphorylation of Ser1072 in the DAD domain providing additional spatiotemporal control [PMID:32294157, PMID:36259517, PMID:36979484]. Beyond protrusive structures, FMNL2 assembles a perinuclear actin meshwork at the Golgi required for anterograde trafficking and endosome maturation, drives invadopodium formation through direct interaction with cortactin, promotes oocyte meiotic spindle migration to the cortex, and interacts with SRC kinase to facilitate androgen receptor nuclear translocation [PMID:28852060, PMID:29374558, PMID:38747713, PMID:40212590]."},"prefetch_data":{"uniprot":{"accession":"Q96PY5","full_name":"Formin-like protein 2","aliases":["Formin homology 2 domain-containing protein 2"],"length_aa":1086,"mass_kda":123.3,"function":"Plays a role in the regulation of cell morphology and cytoskeletal organization. Required in the cortical actin filament dynamics","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q96PY5/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/FMNL2","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"ACTG1","stoichiometry":0.2},{"gene":"PFN1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/FMNL2","total_profiled":1310},"omim":[{"mim_id":"619889","title":"T-COMPLEX PROTEIN 11-LIKE 2; TCP11L2","url":"https://www.omim.org/entry/619889"},{"mim_id":"616890","title":"SPLIT-FOOT MALFORMATION WITH MESOAXIAL POLYDACTYLY; SFMMP","url":"https://www.omim.org/entry/616890"},{"mim_id":"616288","title":"FORMIN-LIKE 3; FMNL3","url":"https://www.omim.org/entry/616288"},{"mim_id":"616285","title":"FORMIN-LIKE 2; FMNL2","url":"https://www.omim.org/entry/616285"},{"mim_id":"609479","title":"MITOGEN-ACTIVATED PROTEIN KINASE KINASE KINASE 20; MAP3K20","url":"https://www.omim.org/entry/609479"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Cytosol","reliability":"Approved"},{"location":"Golgi apparatus","reliability":"Additional"},{"location":"Plasma membrane","reliability":"Additional"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"brain","ntpm":214.1}],"url":"https://www.proteinatlas.org/search/FMNL2"},"hgnc":{"alias_symbol":["KIAA1902"],"prev_symbol":["FHOD2"]},"alphafold":{"accession":"Q96PY5","domains":[{"cath_id":"-","chopping":"75-152_205-245","consensus_level":"medium","plddt":91.3089,"start":75,"end":245},{"cath_id":"1.25.10.10","chopping":"253-377","consensus_level":"medium","plddt":93.2758,"start":253,"end":377},{"cath_id":"-","chopping":"697-776","consensus_level":"high","plddt":90.4623,"start":697,"end":776},{"cath_id":"1.20.58.2220","chopping":"818-885_967-1006","consensus_level":"medium","plddt":90.8987,"start":818,"end":1006},{"cath_id":"1.10.20","chopping":"33-70","consensus_level":"high","plddt":85.8134,"start":33,"end":70},{"cath_id":"1.10.287","chopping":"798-816_893-965","consensus_level":"medium","plddt":94.1593,"start":798,"end":965}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96PY5","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96PY5-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96PY5-F1-predicted_aligned_error_v6.png","plddt_mean":76.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=FMNL2","jax_strain_url":"https://www.jax.org/strain/search?query=FMNL2"},"sequence":{"accession":"Q96PY5","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96PY5.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96PY5/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96PY5"}},"corpus_meta":[{"pmid":"22608513","id":"PMC_22608513","title":"FMNL2 drives actin-based protrusion and migration downstream of Cdc42.","date":"2012","source":"Current biology : CB","url":"https://pubmed.ncbi.nlm.nih.gov/22608513","citation_count":172,"is_preprint":false},{"pmid":"12684686","id":"PMC_12684686","title":"Identification and characterization of human FMNL1, FMNL2 and FMNL3 genes in silico.","date":"2003","source":"International journal of oncology","url":"https://pubmed.ncbi.nlm.nih.gov/12684686","citation_count":128,"is_preprint":false},{"pmid":"23201162","id":"PMC_23201162","title":"MicroRNA-137, an HMGA1 target, suppresses colorectal cancer cell invasion and metastasis in mice by directly targeting FMNL2.","date":"2012","source":"Gastroenterology","url":"https://pubmed.ncbi.nlm.nih.gov/23201162","citation_count":117,"is_preprint":false},{"pmid":"18665374","id":"PMC_18665374","title":"Overexpression of FMNL2 is closely related to metastasis of colorectal cancer.","date":"2008","source":"International journal of colorectal disease","url":"https://pubmed.ncbi.nlm.nih.gov/18665374","citation_count":72,"is_preprint":false},{"pmid":"25963737","id":"PMC_25963737","title":"The structure of FMNL2-Cdc42 yields insights into the mechanism of lamellipodia and filopodia formation.","date":"2015","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/25963737","citation_count":69,"is_preprint":false},{"pmid":"26515696","id":"PMC_26515696","title":"MicroRNA-206 functions as a tumor suppressor in colorectal cancer by targeting FMNL2.","date":"2015","source":"Journal of cancer research and clinical oncology","url":"https://pubmed.ncbi.nlm.nih.gov/26515696","citation_count":60,"is_preprint":false},{"pmid":"21071512","id":"PMC_21071512","title":"FMNL2 enhances invasion of colorectal carcinoma by inducing epithelial-mesenchymal transition.","date":"2010","source":"Molecular cancer research : 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sciences","url":"https://pubmed.ncbi.nlm.nih.gov/31115001","citation_count":19,"is_preprint":false},{"pmid":"29805686","id":"PMC_29805686","title":"KIT, NRAS, BRAF and FMNL2 mutations in oral mucosal melanoma and a systematic review of the literature.","date":"2018","source":"Oncology letters","url":"https://pubmed.ncbi.nlm.nih.gov/29805686","citation_count":15,"is_preprint":false},{"pmid":"27578625","id":"PMC_27578625","title":"A specific FMNL2 isoform is up-regulated in invasive cells.","date":"2016","source":"BMC cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/27578625","citation_count":14,"is_preprint":false},{"pmid":"29579104","id":"PMC_29579104","title":"A Rac1-FMNL2 signaling module affects cell-cell contact formation independent of Cdc42 and membrane protrusions.","date":"2018","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/29579104","citation_count":14,"is_preprint":false},{"pmid":"38747713","id":"PMC_38747713","title":"FMNL2 regulates actin for endoplasmic reticulum and mitochondria distribution in oocyte meiosis.","date":"2024","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/38747713","citation_count":13,"is_preprint":false},{"pmid":"35646112","id":"PMC_35646112","title":"circRNA TCFL5 Promote Esophageal Cancer Progression by Modulating M2 Macrophage Polarization via the miR-543-FMNL2 Axis.","date":"2022","source":"Journal of oncology","url":"https://pubmed.ncbi.nlm.nih.gov/35646112","citation_count":13,"is_preprint":false},{"pmid":"36259517","id":"PMC_36259517","title":"Cooperative assembly of filopodia by the formin FMNL2 and I-BAR domain protein IRTKS.","date":"2022","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/36259517","citation_count":12,"is_preprint":false},{"pmid":"31298385","id":"PMC_31298385","title":"MicroRNA-22 targets FMNL2 to inhibit melanoma progression via the regulation of the Wnt/β-catenin signaling pathway and epithelial-mesenchymal transition.","date":"2019","source":"European review for medical and pharmacological sciences","url":"https://pubmed.ncbi.nlm.nih.gov/31298385","citation_count":11,"is_preprint":false},{"pmid":"36335129","id":"PMC_36335129","title":"LINC00839 promotes malignancy of liver cancer via binding FMNL2 under hypoxia.","date":"2022","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/36335129","citation_count":9,"is_preprint":false},{"pmid":"36979484","id":"PMC_36979484","title":"Spatiotemporal Regulation of FMNL2 by N-Terminal Myristoylation and C-Terminal Phosphorylation Drives Rapid Filopodia Formation.","date":"2023","source":"Biomolecules","url":"https://pubmed.ncbi.nlm.nih.gov/36979484","citation_count":8,"is_preprint":false},{"pmid":"18971169","id":"PMC_18971169","title":"[Expression of FMNL2 and its relation to the metastatic potential of human colorectal cancer cells].","date":"2008","source":"Nan fang yi ke da xue xue bao = Journal of Southern Medical University","url":"https://pubmed.ncbi.nlm.nih.gov/18971169","citation_count":8,"is_preprint":false},{"pmid":"32017087","id":"PMC_32017087","title":"TCP11L2 promotes bovine skeletal muscle-derived satellite cell migration and differentiation via FMNL2.","date":"2020","source":"Journal of cellular physiology","url":"https://pubmed.ncbi.nlm.nih.gov/32017087","citation_count":7,"is_preprint":false},{"pmid":"34043722","id":"PMC_34043722","title":"Characterization of a L136P mutation in Formin-like 2 (FMNL2) from a patient with chronic inflammatory bowel disease.","date":"2021","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/34043722","citation_count":7,"is_preprint":false},{"pmid":"33169848","id":"PMC_33169848","title":"Caveolin-1 influences epithelial collective cell migration via FMNL2 formin.","date":"2020","source":"Biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/33169848","citation_count":6,"is_preprint":false},{"pmid":"34257650","id":"PMC_34257650","title":"MiR-466 Inhibits the Progression of Severe Hepatocellular Carcinoma via Regulating FMNL2-Mediated Activation of NF-κB and Wnt/β-Catenin Pathways.","date":"2021","source":"Journal of oncology","url":"https://pubmed.ncbi.nlm.nih.gov/34257650","citation_count":6,"is_preprint":false},{"pmid":"35379791","id":"PMC_35379791","title":"FMNL2 suppresses cell migration and invasion of breast cancer: a reduction of cytoplasmic p27 via RhoA/LIMK/Cofilin pathway.","date":"2022","source":"Cell death discovery","url":"https://pubmed.ncbi.nlm.nih.gov/35379791","citation_count":6,"is_preprint":false},{"pmid":"29090051","id":"PMC_29090051","title":"FMNL2 with Functions Related to the Cytoskeleton is Partially Regulated by PAX6.","date":"2017","source":"Journal of ophthalmic & vision research","url":"https://pubmed.ncbi.nlm.nih.gov/29090051","citation_count":4,"is_preprint":false},{"pmid":"40212590","id":"PMC_40212590","title":"FMNL2/SRC-mediated androgen receptor translocation into the nucleus promotes enzalutamide resistance of prostate cancer.","date":"2025","source":"iScience","url":"https://pubmed.ncbi.nlm.nih.gov/40212590","citation_count":0,"is_preprint":false},{"pmid":"38891874","id":"PMC_38891874","title":"Identification of an FMNL2 Interactome by Quantitative Mass Spectrometry.","date":"2024","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/38891874","citation_count":0,"is_preprint":false},{"pmid":"38071036","id":"PMC_38071036","title":"[Effect of miR-22 Targeting FMNL2 on Cell Migration and Apoptosis in Childhood Acute Myeloid Leukemia].","date":"2023","source":"Zhongguo shi yan xue ye xue za zhi","url":"https://pubmed.ncbi.nlm.nih.gov/38071036","citation_count":0,"is_preprint":false},{"pmid":"40301744","id":"PMC_40301744","title":"The formin FMNL2 plays a role in the response of melanoma cells to substrate stiffness.","date":"2025","source":"BMC molecular and cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/40301744","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":22999,"output_tokens":4963,"usd":0.071721},"stage2":{"model":"claude-opus-4-6","input_tokens":8506,"output_tokens":3718,"usd":0.20322},"total_usd":0.274941,"stage1_batch_id":"msgbatch_0118RScg3WGaGkaZRtWZbtce","stage2_batch_id":"msgbatch_01Cpfzvtbj42aqp5oYZ5Te2s","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2012,\n      \"finding\": \"FMNL2 is cotranslationally modified by N-terminal myristoylation, which together with interaction with active Cdc42, is required for proper subcellular targeting to lamellipodia and filopodia tips. Abolition of myristoylation or Cdc42 binding prevents FMNL2 activation and membrane targeting.\",\n      \"method\": \"Site-directed mutagenesis (Gly2→Ala to block myristoylation, Cdc42-binding mutants), immunofluorescence, RNAi knockdown\",\n      \"journal\": \"Current Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — mutagenesis + in vitro biochemical assays + live-cell localization, replicated across multiple orthogonal methods in one study\",\n      \"pmids\": [\"22608513\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"FMNL2 acts as an actin filament elongation factor (not nucleator) in the presence of profilin in vitro, and can capture and elongate filament ends generated by Arp2/3-mediated branching. RNAi-mediated silencing decreases lamellipodia protrusion rate and cell migration efficiency.\",\n      \"method\": \"In vitro actin polymerization/TIRF assays with purified proteins, RNAi knockdown with quantitative lamellipodium protrusion and migration assays\",\n      \"journal\": \"Current Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution assay with purified proteins plus functional RNAi validation, multiple orthogonal methods\",\n      \"pmids\": [\"22608513\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Crystal structures of the N-terminal domains of human FMNL1 and FMNL2 in complex with active Cdc42 reveal that Cdc42 contacts all five armadillo repeats of the formin, with specific interactions formed by the Rho-GTPase insert helix. Mutation of three residues in Rac1 confers gain-of-function FMNL2 binding and reconstitutes the Cdc42 phenotype in vivo. FMNL dimerization via a parallel coiled coil creates an umbrella-shaped structure spanning >15 nm with six membrane interaction motifs.\",\n      \"method\": \"X-ray crystallography, site-directed mutagenesis of Rac1/Cdc42 switch residues, in vivo functional rescue assays\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure plus mutagenesis with in vivo validation\",\n      \"pmids\": [\"25963737\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"N-myristoylation at Gly2 of FMNL2 is required for plasma membrane association and for the induction of cellular morphological changes; replacement of Gly2 with Ala or pharmacological inhibition of N-myristoyltransferase abolishes membrane localization and morphological effects.\",\n      \"method\": \"Site-directed mutagenesis (Gly2→Ala), N-myristoylation inhibitor treatment, immunofluorescence in HEK293T cells\",\n      \"journal\": \"Bioscience, Biotechnology, and Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — mutagenesis plus chemical inhibition, orthogonal approaches confirming same conclusion\",\n      \"pmids\": [\"22790947\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"FMNL2 and FMNL3 accumulate at the Golgi apparatus in a manner requiring both N-terminal myristoylation and interaction with Cdc42. At the Golgi, they assemble a perinuclear actin meshwork; their depletion by RNAi or CRISPR/Cas9 causes Golgi fragmentation, enlargement of endosomes, defective maturation into late endosomes/lysosomes, and impaired anterograde trafficking of VSV-G to the plasma membrane.\",\n      \"method\": \"RNAi, CRISPR/Cas9 knockout, live-cell imaging of VSV-G trafficking, immunofluorescence, myristoylation and Cdc42-binding mutants\",\n      \"journal\": \"Scientific Reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — RNAi and CRISPR KO with multiple defined phenotypic readouts plus mutagenesis, multiple orthogonal methods\",\n      \"pmids\": [\"28852060\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"FMNL2 knockdown in colorectal carcinoma cells induces an epithelial-state transition (cobblestone morphology, upregulation of E-cadherin/α-catenin/γ-catenin, downregulation of vimentin/snail/slug) and abolishes TGF-β-induced invasion and EMT. FMNL2 promotes EMT via TGF-β/Smad3 effectors and in collaboration with MAPK/MEK pathway; MEK inhibitor U0126 abrogates elevated p-MAPK/p-MEK in FMNL2-overexpressing cells.\",\n      \"method\": \"shRNA knockdown, overexpression, morphological analysis, Western blotting for EMT markers, kinase inhibitor treatment (U0126, LY294002), TGF-β stimulation assays\",\n      \"journal\": \"Molecular Cancer Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KD/OE with defined cellular phenotype and pathway inhibitor validation, single lab\",\n      \"pmids\": [\"21071512\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"FMNL2 physically interacts with COMMD10 (by Co-IP and GST pull-down) and promotes its ubiquitin-mediated proteasomal degradation. Loss of COMMD10 releases p65 NF-κB from inhibition, allowing nuclear translocation of p65 and activation of the NF-κB pathway to promote CRC invasion and metastasis.\",\n      \"method\": \"Co-immunoprecipitation, GST pull-down, in vitro ubiquitination assay, dual-luciferase NF-κB reporter, nuclear fractionation, Western blotting, animal metastasis models\",\n      \"journal\": \"British Journal of Cancer\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct protein interaction confirmed by Co-IP and GST pull-down plus in vitro ubiquitination assay plus functional pathway reporters\",\n      \"pmids\": [\"28817833\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Cortactin directly binds FMNL2 and cooperatively enhances actin polymerization and recycling endosome motility. This cortactin–FMNL2 interaction is required for invadopodia formation and matrix degradation in colorectal cancer cells; EGF/Cdc42 stimulation further enhances the cortactin–FMNL2 complex to increase invadopodia number and matrix degradation.\",\n      \"method\": \"Co-immunoprecipitation, GST pull-down, actin polymerization assays, live-cell imaging of endosome motility, invadopodia formation assays, gelatin matrix degradation assay, in vivo metastasis model\",\n      \"journal\": \"Cancer Letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct binding confirmed by reciprocal Co-IP and GST pull-down plus multiple functional readouts\",\n      \"pmids\": [\"29374558\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"FMNL2 directly binds dephosphorylated fascin within filopodia and controls fascin dynamics (phosphorylation state, F-actin binding, localization) at the nanoscale in both 2D and 3D environments, as shown by a fascin FRET biosensor and advanced live-cell imaging.\",\n      \"method\": \"FRET-based fascin biosensor, structured illumination microscopy, TIRF-SIM, co-immunoprecipitation, RNAi knockdown, live-cell imaging\",\n      \"journal\": \"Journal of Cell Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct binding by Co-IP plus quantitative live-cell biosensor imaging with multiple orthogonal microscopy methods\",\n      \"pmids\": [\"32294157\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Induced depletion of Arp2/3 complex (Actr3 knockout) reproducibly increases FMNL2 and FMNL3 formin expression, which correlates with explosive induction of filopodia formation, revealing a compensatory or co-regulatory relationship between branched (Arp2/3) and unbranched (FMNL2/3) actin networks.\",\n      \"method\": \"Conditional CRISPR/Cas9 Actr3 knockout (tamoxifen-inducible), immunoblotting, live-cell imaging, quantitative filopodia analysis\",\n      \"journal\": \"Frontiers in Cell and Developmental Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean conditional KO with defined molecular and cellular phenotype, single lab\",\n      \"pmids\": [\"33598464\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"FMNL2 mediates cell-cell contact formation downstream of Rac1, independently of Cdc42. CRISPR/Cas9 loss of FMNL2 in MCF10A cells impairs intercellular contact establishment; optogenetic Rac1 activation recruits FMNL2 to newly forming junctions, whereas Cdc42 silencing does not affect FMNL2-mediated contact formation.\",\n      \"method\": \"CRISPR/Cas9 knockout, optogenetic Rac1 activation, live-cell imaging of junction formation, RNAi, quantitative protrusion analysis\",\n      \"journal\": \"PLoS ONE\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — CRISPR KO plus optogenetics provides clean mechanistic epistasis, replicated with multiple approaches in one study\",\n      \"pmids\": [\"29579104\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"FMNL2-dependent rapid filopodia formation requires both N-terminal myristoylation (for filopodia tip localization) and serine 1072 phosphorylation within the DAD domain by PKCα. PKCα localizes to the base of growing filopodia and a PKCα-FMNL2 signaling module spatiotemporally controls filopodia dynamics.\",\n      \"method\": \"Structured illumination microscopy, phospho-site mutagenesis (S1072A), PKCα inhibition/knockdown, live-cell imaging, immunofluorescence co-localization\",\n      \"journal\": \"Biomolecules\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 — mutagenesis of phospho-site plus chemical and genetic inhibition of PKCα, single lab\",\n      \"pmids\": [\"36979484\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"A disease-associated heterozygous FMNL2 p.L136P mutation causes subcellular mislocalization, deregulated autoinhibition (gain-of-function), impaired cell spreading, defective filopodia formation in fibroblasts, and dysregulated podosome formation with defective matrix degradation in THP-1 macrophages.\",\n      \"method\": \"Expression of L136P mutant vs. wild-type in patient-derived and model cell lines, immunofluorescence localization, cell spreading assay, filopodia quantification, podosome formation, gelatin degradation assay\",\n      \"journal\": \"PLoS ONE\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional characterization of disease mutation with multiple cellular phenotype readouts, single lab\",\n      \"pmids\": [\"34043722\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"FMNL2 cooperates with the I-BAR domain protein IRTKS (but not IRSp53) to drive filopodia assembly. FMNL2 and IRTKS are mutually dependent cofactors; the primary function of FMNL2 in this process is membrane binding to recruit IRTKS, which then nucleates filopodia assembly, while FH2-mediated actin dynamics is secondary.\",\n      \"method\": \"Co-immunoprecipitation, co-expression studies, filopodia quantification, RNAi knockdown of IRTKS/IRSp53, domain mutagenesis\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — direct binding by Co-IP plus functional epistasis via RNAi, single lab with multiple orthogonal approaches\",\n      \"pmids\": [\"36259517\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"FMNL2 localizes to the oocyte cortex and spindle periphery during meiosis; its depletion reduces cytoplasmic actin polymerization, causes failure of meiotic spindle migration to the cortex, leading to polar body extrusion defects and large polar bodies. FMNL2 also associates with mitochondria and ER-related proteins (by mass spectrometry), and its depletion disrupts mitochondrial membrane potential and causes ER stress.\",\n      \"method\": \"Morpholino/siRNA knockdown in mouse and porcine oocytes, live-cell imaging, immunofluorescence, mass spectrometry proteomics, mRNA rescue microinjection, JC-1 mitochondrial membrane potential assay\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — loss-of-function in two species with rescue experiment, live imaging, and proteomics, multiple orthogonal methods\",\n      \"pmids\": [\"38747713\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Proximity labeling proteomics (BioID) identified an FMNL2 interactome including known partners and novel interactors related to filopodia, lamellipodia, vesicle trafficking, cell junctions, focal adhesions, and extracellular vesicles; FMNL2 protein was directly detected in exosomes.\",\n      \"method\": \"BioID proximity labeling, quantitative mass spectrometry proteomics, exosome isolation and Western blotting\",\n      \"journal\": \"International Journal of Molecular Sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — systematic proximity proteomics with direct exosome validation, single lab\",\n      \"pmids\": [\"38891874\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"FMNL2 directly interacts with SRC kinase through the FMNL2-FH1 domain and SRC-SH3 domain, and this interaction promotes androgen receptor (AR) translocation from cytoplasm to nucleus, increasing AR target gene expression and driving enzalutamide resistance in prostate cancer cells.\",\n      \"method\": \"Co-immunoprecipitation, domain mapping, nuclear fractionation, AR reporter assays, RNAi knockdown, SRC inhibitor (dasatinib) treatment, proliferation assays\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — direct interaction confirmed by Co-IP with domain mapping plus functional pathway validation, single lab\",\n      \"pmids\": [\"40212590\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CAV1 (Caveolin-1) modulates collective epithelial cell migration by controlling cortical availability of FMNL2; CAV1 depletion increases cortical recruitment of FMNL2, and simultaneous depletion of FMNL2 rescues the migration defect caused by CAV1 RNAi, placing FMNL2 downstream of CAV1 in collective migration.\",\n      \"method\": \"RNAi (CAV1 and FMNL2 single and double knockdown), collective migration velocity correlation analysis, immunofluorescence\",\n      \"journal\": \"Biology of the Cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis by double knockdown with quantitative migration phenotype, single lab\",\n      \"pmids\": [\"33169848\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"FMNL2 suppresses breast cancer cell migration and invasion by inhibiting the RhoA/LIMK/Cofilin pathway, and this effect is mediated through reduction of cytoplasmic p27. ERα overexpression reduces FMNL2 protein levels via proteasomal degradation (blocked by MG132).\",\n      \"method\": \"RNAi knockdown, overexpression, Rho inhibitor (ZOL) and LIMK inhibitor (BMS3) treatment, Western blotting for RhoA/LIMK/Cofilin, cytoplasmic p27 manipulation, MG132 proteasome inhibition, in vivo xenograft\",\n      \"journal\": \"Cell Death Discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD/OE with pathway inhibitor validation and pathway placement, single lab\",\n      \"pmids\": [\"35379791\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"FMNL2 is a Diaphanous-related formin that is cotranslationally N-myristoylated at Gly2 and autoinhibited until activated by binding of active Cdc42 (or Rac1) to its N-terminal armadillo repeats, whereupon it targets to lamellipodia/filopodia tips and the Golgi apparatus to drive actin filament elongation (not nucleation) in the presence of profilin; at filopodia it cooperates with IRTKS and regulates fascin dynamics, its membrane targeting and filopodia formation are additionally controlled by PKCα-mediated phosphorylation of Ser1072 in the DAD domain, and it participates in Golgi-dependent anterograde trafficking, oocyte meiotic spindle migration, cell-cell junction formation downstream of Rac1, invadopodium formation via direct interaction with cortactin, and nuclear AR translocation via direct interaction with SRC kinase.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"FMNL2 is a Diaphanous-related formin that drives actin-dependent membrane dynamics in cell migration, junction formation, intracellular trafficking, and meiotic spindle positioning. It is cotranslationally N-myristoylated at Gly2 and maintained in an autoinhibited state until activated by Cdc42 (or Rac1 at cell–cell junctions), whereupon it targets to lamellipodia/filopodia tips and the Golgi, functioning as a profilin-dependent actin filament elongation factor—not a nucleator—that captures and extends Arp2/3-generated barbed ends [PMID:22608513, PMID:25963737, PMID:28852060, PMID:29579104]. At filopodia, FMNL2 cooperates with the I-BAR protein IRTKS to initiate filopodia assembly and directly binds and regulates fascin dynamics, with PKCα-mediated phosphorylation of Ser1072 in the DAD domain providing additional spatiotemporal control [PMID:32294157, PMID:36259517, PMID:36979484]. Beyond protrusive structures, FMNL2 assembles a perinuclear actin meshwork at the Golgi required for anterograde trafficking and endosome maturation, drives invadopodium formation through direct interaction with cortactin, promotes oocyte meiotic spindle migration to the cortex, and interacts with SRC kinase to facilitate androgen receptor nuclear translocation [PMID:28852060, PMID:29374558, PMID:38747713, PMID:40212590].\",\n  \"teleology\": [\n    {\n      \"year\": 2010,\n      \"claim\": \"Establishing that FMNL2 promotes epithelial-to-mesenchymal transition and invasion in colorectal cancer cells linked it to the TGF-β/Smad3 and MAPK/MEK signaling cascades, providing the first functional context for the gene in cancer cell plasticity.\",\n      \"evidence\": \"shRNA knockdown and overexpression in CRC cells with EMT marker profiling and kinase inhibitor treatment\",\n      \"pmids\": [\"21071512\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which FMNL2 activates MAPK/MEK is indirect and unresolved\", \"Single lab, no independent replication\", \"No demonstration of direct formin-actin activity in this context\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defining FMNL2 as a profilin-dependent actin filament elongator (not nucleator) that requires cotranslational N-myristoylation and Cdc42 binding for membrane targeting established its core biochemical activity and activation mechanism.\",\n      \"evidence\": \"TIRF-based in vitro actin polymerization with purified proteins, site-directed mutagenesis (Gly2→Ala, Cdc42-binding mutants), RNAi with quantitative lamellipodium and migration assays in B16-F1 cells\",\n      \"pmids\": [\"22608513\", \"22790947\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structure of the autoinhibited full-length dimer\", \"Profilin isoform specificity not determined\", \"In vivo kinetics of elongation vs. Arp2/3 cooperation not measured\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Crystal structures of FMNL2 N-terminal domains bound to Cdc42 revealed how all five armadillo repeats and the Rho-GTPase insert helix mediate specificity, and how an umbrella-shaped dimer with six membrane-interaction motifs couples GTPase sensing to membrane association.\",\n      \"evidence\": \"X-ray crystallography of FMNL1/FMNL2–Cdc42 complexes, mutagenesis of Rac1 to confer Cdc42-like binding with in vivo rescue\",\n      \"pmids\": [\"25963737\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structure capturing the transition from autoinhibited to active state\", \"Structural basis for Rac1 activation at junctions vs. Cdc42 activation at filopodia unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrating that FMNL2 localizes to the Golgi in a myristoylation- and Cdc42-dependent manner and is required for Golgi integrity, endosome maturation, and anterograde trafficking expanded its role from a lamellipodia/filopodia factor to a central organizer of membrane traffic.\",\n      \"evidence\": \"RNAi and CRISPR/Cas9 KO with live-cell VSV-G trafficking, Golgi fragmentation, and endosome analysis\",\n      \"pmids\": [\"28852060\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of actin structures assembled at the Golgi not fully resolved\", \"Whether FMNL2 acts at the Golgi independently of FMNL3 is unclear\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identification of COMMD10 as a direct FMNL2 binding partner whose ubiquitin-mediated degradation by FMNL2 de-represses NF-κB/p65 signaling revealed a non-canonical signaling function beyond actin assembly.\",\n      \"evidence\": \"Co-IP, GST pull-down, in vitro ubiquitination assay, NF-κB reporter, nuclear fractionation, in vivo metastasis model\",\n      \"pmids\": [\"28817833\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether FMNL2 itself has E3 ligase activity or recruits an E3 ligase is not resolved\", \"Relevance outside colorectal cancer not tested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Showing that cortactin directly binds FMNL2 and cooperatively enhances actin polymerization for invadopodia formation and recycling endosome motility linked the formin to matrix degradation-competent structures.\",\n      \"evidence\": \"Reciprocal Co-IP, GST pull-down, actin polymerization assays, invadopodia and gelatin degradation assays, live-cell endosome tracking\",\n      \"pmids\": [\"29374558\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Binding interface between cortactin and FMNL2 not mapped\", \"Whether cortactin relieves autoinhibition or acts allosterically is unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstrating that FMNL2 mediates Rac1-dependent cell–cell junction formation independently of Cdc42 established a second Rho-GTPase activation axis for the formin in a distinct cellular context.\",\n      \"evidence\": \"CRISPR/Cas9 KO in MCF10A cells, optogenetic Rac1 activation with live-cell junction imaging, Cdc42 RNAi epistasis\",\n      \"pmids\": [\"29579104\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Rac1 structurally activates FMNL2 given the Cdc42-specific insert helix contacts is unknown\", \"Downstream actin structures at nascent junctions not characterized\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Live-cell FRET biosensor imaging revealed that FMNL2 directly binds dephosphorylated fascin in filopodia and controls fascin dynamics at nanoscale resolution, linking the formin to actin-bundling regulation.\",\n      \"evidence\": \"FRET-based fascin biosensor, SIM/TIRF-SIM, Co-IP, RNAi\",\n      \"pmids\": [\"32294157\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether FMNL2 directly modulates fascin phosphorylation or acts via kinase/phosphatase recruitment is unresolved\", \"Binding interface between FMNL2 and fascin not mapped\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Upregulation of FMNL2 upon Arp2/3 complex depletion, coinciding with explosive filopodia induction, revealed a compensatory relationship between branched and unbranched actin networks.\",\n      \"evidence\": \"Conditional CRISPR/Cas9 Actr3 KO, immunoblotting, quantitative filopodia analysis\",\n      \"pmids\": [\"33598464\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Transcriptional vs. post-translational mechanism of FMNL2 upregulation not determined\", \"Single cell system (B16-F1)\", \"Functional requirement of FMNL2 for the filopodia phenotype not directly tested by double KO\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showing that FMNL2 cooperates with the I-BAR protein IRTKS (not IRSp53) for filopodia assembly, with FMNL2's primary role being membrane recruitment of IRTKS rather than FH2-mediated actin elongation, reframed FMNL2 as a membrane-targeting scaffold in filopodia initiation.\",\n      \"evidence\": \"Co-IP, co-expression, filopodia quantification, RNAi of IRTKS/IRSp53, domain mutagenesis\",\n      \"pmids\": [\"36259517\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; IRTKS–FMNL2 interface not structurally resolved\", \"Relative contributions of membrane binding vs. actin elongation not quantified in vivo\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identification of PKCα-mediated Ser1072 phosphorylation in the DAD domain as required for rapid filopodia formation uncovered a post-translational regulatory layer controlling FMNL2 activation kinetics.\",\n      \"evidence\": \"Phospho-site mutagenesis (S1072A), PKCα inhibition and knockdown, SIM live-cell imaging\",\n      \"pmids\": [\"36979484\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether S1072 phosphorylation relieves autoinhibition or promotes a distinct conformational change is untested\", \"In vitro kinase assay for direct PKCα phosphorylation of S1072 not shown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstrating that FMNL2 drives cytoplasmic actin polymerization required for meiotic spindle migration to the oocyte cortex, with its depletion causing polar body extrusion defects and mitochondrial/ER stress, extended the formin's function to female gamete maturation.\",\n      \"evidence\": \"Morpholino/siRNA knockdown in mouse and porcine oocytes, mRNA rescue, live-cell imaging, mass spectrometry proteomics, JC-1 assay\",\n      \"pmids\": [\"38747713\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether FMNL2 directly organizes mitochondrial/ER membranes or the stress is secondary to actin disorganization is unclear\", \"Upstream activating GTPase in oocytes not identified\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Discovery that FMNL2 directly interacts with SRC kinase (FH1–SH3 domains) to promote androgen receptor nuclear translocation and enzalutamide resistance revealed a kinase-scaffolding function in hormone signaling.\",\n      \"evidence\": \"Co-IP with domain mapping, nuclear fractionation, AR reporter, dasatinib treatment, RNAi\",\n      \"pmids\": [\"40212590\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether the FMNL2–SRC interaction is actin-dependent or independent is not tested\", \"Single cancer cell system (prostate)\", \"No structural model of the FH1–SH3 interaction\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A full-length structure of autoinhibited and activated FMNL2 dimer, the mechanism by which FMNL2 promotes COMMD10 ubiquitination, whether PKCα directly phosphorylates S1072 in vitro, and how Rac1 achieves activation despite the Cdc42-specific structural contacts remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No full-length structure\", \"E3 ligase identity for COMMD10 degradation unknown\", \"Direct PKCα–FMNL2 kinase reaction not reconstituted\", \"Rac1 activation mechanism structurally unresolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [1, 8, 13]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [13, 16]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 3, 11]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [1, 8, 14]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 14]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [4, 15]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [10]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [4, 15]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [5, 6, 16]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [14]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [14]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"CDC42\",\n      \"RAC1\",\n      \"FSCN1\",\n      \"CTNND1\",\n      \"IRTKS\",\n      \"SRC\",\n      \"COMMD10\",\n      \"CTTN\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}